Magnum. Winchester 760 and Hodgdon H-414 were on the list, and since the latter powder had not been used for quite a while, it was included. Both Jack O’Connor and Warren Page also had high praise for the .257 Roberts, but differed somewhat when it came to the subject of reloading the cartridge. One of its advantages, Ackley noted, is the fact that 257 Roberts factory ammunition can be used in an improved rifl e if necessary. 325 Win. 284 Win. When it comes to powders, because of its moderate case capacity of roughly 53.0 grains of water, many modern powders work well in the Roberts. Magnum . For flexible usage, we provide our reloading data in metric and imperial dimension systems, i.e. charge weight in grams and grains as well as muzzle velocity in meters and feet per second. A rifle was sent to me several months later and was used successfully on antelope the following year. Reloading Questions; About. Townsend Whelen mentioned in one of his many books: “I think that no man ever spent so much time in perfecting a cartridge as Mr. Roberts spent on this one.”. What has shocked me was I tried some round nose 117 Winchester ammo and it liked it. I wound up with more than a dozen powders to test, from Benchmark to IMR-7828. I'm getting ready to start loading for a Roberts I recently bought. Although accuracy was not impressive, velocity was high. Energy increases were nothing to brag about. If this is your first visit to Sages Reloading Forum, be sure to check out the FAQ by clicking the link above. Ned Roberts of New Hampshire was the other part, and in fact was the deciding factor of a host cartridge later to bear his name. Bullet Weight. All the rifle loads on these pages are pressure tested accor Find what you need in four easy steps. I embarked on my .257 AI project almost by accident. Short Action Ultra Magnum. The .257 Roberts has (finally) been updated to piezoelectric pressure measurements, with standard pressure loads listed at 54,000 psi while +P loads are listed at 58,000 psi. I just don't see the need for hiper velocity in a 257. JD338 _____ An Accidental Endeavor The ballistic performance based off four grain types for velocity are 3,563 ft/s (75 gr), … Joined Nov 25, 2007 Messages 32. 300 Rem. Take Aim at Rifle Reloading Data. I have asked similar before, but now I am about to load my test loads this weekend and hate going in blind. If you can find a copy of it you would be well off. : Doubletap 100 gr. $13.27 $ 13. .257 roberts seven cdl remington model 7 22" robert curly maple stock limited run 85906 22 inch " barrel saint marys, pa 15857: new: 2/10/2021: $1,550.00 .257 roberts remington seven cdl curly maple 257 (nib) hard to find 26400 22 inch " barrel westfield, pa 16950-8758: new: 2/1/2021: $1,397.00 .257 roberts ruger & company inc ruger no. Used it for decades and it has worked well. Today, few commercial rifles are available. Lighter bullets from 75 to 90 grains included hollowpoint, spitzers and even a box of moly-coated hollowpoints I had in stock for some time. 257 roberts. More Buying Choices $6.95 (6 new offers) LEE PRECISION 338 WM Pacesetter Dies. Download our Apple App! The .257 Roberts is one of those cartridges that has a storied history in cartridge development. The maximum loads in the accompanying data are almost all +P pressures. 257 roberts. Click "Get Data" to … The .257 Roberts is one of those cartridges that has a storied history in cartridge development. Basic components for the .257 Roberts are generally easy to find. The .25-06 which holds another 8 or 9 grains of powder outperforms the .257 Ackley by about 200fps. The Model 70 XTR Featherweight I took to Montana was fitted with a Leupold Vari-X III 2.5-8x scope. 27. 270 Win. MV is 3000 fps and it shoots .5 MOA from a M700 Classic. These were thought to be rather stout loads. The .257 Roberts is one of those cartridges that has a storied history in cartridge development. As it turned out, the .257 Roberts was chosen because I had obtained a rifle about a year earlier. (22 inch barrel), ME 2162 ft. Filter By Done. Noted gun and cartridge experimenter – Dr. Franklin Mann – was indeed a very important part of the .25-caliber concept. Niedner and L.C. The .257 is offered in a number of factory loads with 117-120 grain bullets. Ultra Magnum. Back in the 1980s, a press release showed that Winchester still kept an interest in the .257 Roberts by introducing a +P version of the cartridge. My favorite deer load is … 300 Rem. Rifles, Reloading, Optics, Equipment. Short Magnum. Magnum primers are not needed simply because of the Roberts’ conservative case volume. A short time later, Winchester chambered the cartridge in both the Model 54 and Model 70 rifles. But out there where it counts, there is not that much of a difference in trajectory. You are making a 257 Roberts into a 25-06. 115 SW Columbia St | Bend, Oregon, USA 97702  |  Toll Free: Nosler Showroom / Open to the Public:  Monday - Friday 10:00 am to 5:30 pm PST, Load Data &Technical Information by Cartridge. In looking up reference material, I found that in the Complete Guide to Handloading, Phil Sharpe seemed to favor the .257 Roberts and IMR-4064 powder with a load of 41.0 grains under a 100-grain bullet, and I tried it with a Swift bullet. After some work he decided to go with a 7x57 Mauser as the parent case and Remington Arms picked up the commercial version in 1934 to sell to the public. Reloading Show all Reloading A Reloader's Comprehensive Glossary .308 Norma Magnum Load Development Calibers Show all Calibers The excellent 308 Norma Magnum 9,3 … You may have to register before you can post: click the register link above to proceed. It may not be as popular, but it’s not dead. The .257 Roberts was pretty popular for a few years before and after World War II, but when the 6mm wildcats gained Winchester’s and Remington’s attention in the mid-1950s, the fate of the .257 Roberts was sealed. Load Data &Technical Information by Caliber. Roberts went to work while considering Mann’s views on the subject. 300 Win. RIFLE RELOADING DATA FILES (PDF) 20 caliber (.204 dia) 204 Ruger 39. The hottest .243 Winchester factory load I was able to identify for the article The .243 Winchester: Its Capabilities as a Deer Cartridge specs out as follows..243 Win. Thread ... . An Accidental Endeavor. The .257 Roberts is a better deer cartridge than the .243 Winchester. Magnum. Quite surprised at the velocity you are getting. Roberts, in his initial attempt in designing this new cartridge, wanted it for small game and varmints hunted at longer than normal shooting distances. Click on … On the list below, you can find all the rifle reloading data we have currently available. Bullet Type Primer. It was plain wrap RPs vs. +P. The hunt would take place just north of Jordan, Montana. Everyone likes to try various powders in their loads for testing. When working with the .257 Roberts and my Model 70, I choose to go the handloading route. I believe it was in an issue of Handloader. Rifle reloading – handloading data for rifle calibers. Hodgdon 4350, IMR-4831, Alliant Reloder 19 and IMR-7828 rounded out the list. To start viewing messages, select the forum that you want to visit from the selection below. 300 H & H Magnum. Wildcat reloading; 257 Roberts Ackley Improved; Download our Android App! 4064. After that, all cases are checked for length, and if they do not come in around 2.223 inches, they are trimmed back to meet this number for consistency. 4.7 out of 5 stars 15. I load my 257 Roberts with 100 gr BT/PT bullets and IMR 4350. Here you will find load data for some of the most recent cartridges on the market, with more being added each week. Anyone have any load suggestions to start with? First on the list was IMR-3031 with lighter bullets. Ackley said that the .257 Roberts Ackley Improved was pr… I am only stating what the numbers show. Other 25 caliber wildcats are not this fl exible. You are making a 257 Roberts into a 25-06. For varmints, our 85 grain Ballistic Tip works very well with faster powders such as RL15 and H380. 257 Roberts. I noted more than 30 years ago that some renowned gun writers casually mentioned the Roberts was on the way out. Browning did the same in its BLRs. Remington introduced the commercial version of this popular wildcatas a low-pressure round. Partition, or the 110 gr. Swift Scirocco II, BC .384, MV 3120 f.p.s. Magnum. With a modern action and handloading, this cartridge is capable of markedly improved performance. 280 Rem. Powder Type. Thread starter 50bowhunter; Start date Mar 23, 2017; Mar 23, 2017 #1 5. Quite surprised at the velocity you are getting. All bullets were seated to the recommended overall loaded length of 2.780 inches. Ballistic Tip, 100 gr. I own two, 257 roberts rifles. At the Orvis flagship store in Manchester, Vermont, I found a brochure at the counter highlighting the rifle. The maximum loads in the accompanying data are almost all +P pressures. Sierra MatchKing Rifle Bullets .25 cal .257" 100 gr HPBT MATCH 100/ct …quality features, a thin jacket for concentricity and uniformity, and precise weight control. 257 Roberts Load Data; 257 Roberts Ackley Improved Load Data; 25 Winchester Super Short Magnum Load Data; 25-06 Remington Load Data; 257 Weatherby Magnum Load Data; 6.5 Grendel Load Data; 6.5 Creedmoor Load Data; 6.5 X 55 Swedish Mauser Load Data; 260 Remington Load Data; 6.5mm-06 A-Square Load Data; 6.5-284 Norma Load Data ; 6.5 Remington Magnum Load Data; 264 Winchester … 280 Rem. ALL 60 gr 75 gr 80 gr 85 gr 87 gr 90 gr 100 gr 115 gr 117 gr 120 gr. Author: Stan Trzoniec / Wolfe Publishing Co. You must be a subscriber to see the full article. I load somewhere in the middle of what most reloading manuals say. Well, okay, maybe. Used it for decades and it has worked well. Cartridge Type: Rifle Height: 2.233" Width: 0.473" Average FPS: 2790 Average Energy: 2039 Average Gr: 118 Recoil: 1.47 Power Rank: 3.29 of 20 The .257 Roberts was designed in the 1920s when wildcatter Ned Roberts started to do experiments on the .257 caliber cartridges. The 22-250 Rem, 6mmRem, and 270 Win use this case head and are SAAMI registered at 65 kpsi. Short Magnum. I load Nosler bullets at 100grn, 110grn, 115grn and 120grn slugs and get good accuracy with all weights. Back home, I called the Winchester public relations office. 30-378 Weatherby. Never had a problem with accuracy and never had to shoot a critter twice. 338 Win. BTW, the .257 Roberts Ackley will do this with those same powders: 100 grain bullets: Max load: 51.5 gr RL 19: 3120 fps. 300 Win. I had read how unpredictable antelope were, and I was determined to get close enough to use a more conservative cartridge. 30-378 Weatherby. While there are several versions of .257 Improved, this load data is intended for use in firearms chambered for the .257 Roberts Ackley Improved (40° shoulder angle). Since the Roberts has been around for quite a while, once-fired brass can still be had at good prices at gun shows. Primers are available in spades, and I had no trouble finding new, unfired brass. 30-06 Spring. The magnum craze was in full swing, but I wanted the challenge of getting close enough that a rifle chambered in .250 Savage or the .257 Roberts would fill the bill. 22 caliber (.224 dia) 22 Hornet TNT Green 30 22 Hornet 33 22 Hornet 40 22 Hornet 50 22 Hornet 52 ... 257 Roberts +P 100 257 Roberts +P 120 25-06 Remington 87 25-06 Remington 100 25-06 Remington 120 25 Winchester Super Short Magnum 87 Thread starter deerslayer64d; Start date Mar 29, 2008; D. deerslayer64d Active Member. Discussion Starter • #1 • Mar 23, 2012. Increase your rifle's performance up to 200 fps without extra chamber pressure, recoil, muzzle blast, temperature sensitivity, fouling, or loss of accuracy. 22-250 Remington Ackley Improved Load Data, 223 Win Super Short Magnum (WSSM) Load Data, 243 Win Super Short Magnum (WSSM) Load Data, 25 Winchester Super Short Magnum Load Data, 270 Winchester Short Magnum (WSM) Load Data, 7mm Rem Short Action Ultra Magnum Load Data, 7mm Shooting Times Westerner (STW) Load Data, 30-06 Springfield Ackley Improved Load Data, 300 Rem Short Action Ultra Magnum Load Data, 300 Holland & Holland (H&H) Magnum Load Data, 300 Winchester Short Magnum (WSM) Load Data, 325 Winchester Short Magnum (WSM) Load Data, 358 Shooting Times Alaskan (STA) Load Data, 375 Holland & Holland (H&H) Magnum Load Data, 45-70 Gov’t (Strong Actions Only) Load Data, 45 Colt (Single Action Army & Replicas) Load Data, 45 Colt (Ruger & T/C Contender & Encore) Load Data. At the time there were many older actions available of questionable strength. 30-06 Spring. Cartridge. One of the common improvements is called the .257 Roberts(+P) which has a SAAMImaximum pressure limit of 58,000 PSI compared to the 54,000 PSI listed for the standard .257 Roberts. 300 Rem. Around 1909 they completed the project with the 7mm Mauser case necked down to .25 caliber complete with a 15-degree shoulder angle. Less than a decade later, the Niedner Rifle Company started turning out rifles in .25 Roberts but with the case extended 1/16 inch to increase powder capacity. The .257 Roberts, also known as .257 Bob, is a medium-powered .25 caliber cartridge. Vintage RCBS dies and CCI BR-2 primers were used to develop load data. P.O. Select your cartridge type from the drop-down list. Reloading . While they are recognized around the world for record-setting accuracy, MatchKing® and Tipped MatchKing® bullets are not recommended for most hunting applications. For a while, Ruger chambered the Roberts (starting in 1975) in the Model 77 and later, the Ruger No. One is a 50's Mauser with 22" raised-solid barrel and super fancy. There is no need to “magnumize” the Roberts, even when using so-called +P brass. 300 Rem. I can’t think of any situation in which this could make that much of a difference on a medium-framed animal over the length of a football field. I worked a second job to save for my first pronghorn and mule deer hunt out West in the fall of 1982. 270 Win. It seemed that the company was testing acceptance of such a reissued rifle with extra detailing (hence the XTR designation) in a number of small geographical areas, and Vermont was one of them. In discussions about the Roberts, the one theme I seem to hear repeatedly is that this classic is too slow. FREE Shipping. My new one is a Remington 700LA Mountain Rifle. If you are not certain about the chamber design in your rifle, we suggest consulting your gunsmith. Short Magnum. One hundred-grain bullets from Hornady, Swift, Nosler and 117-grain Hornady boat-tail Spire Points rounded out the selection. His choice in brass was the 7mm Mauser necked down to .25 caliber. Joined Sep 15, 2016 Messages 133 Location Virginia . At the time of this cartridge’s infancy, Dr. Mann conceded – after much experimenting – that existing powders of the day would perform much better under a .25-caliber bullet if the case capacity matched closely to that of the .30-40 Krag. RCBS 20515 Carbide Die Set, 9MMLUGER/9x21/9x23. According to the history I’ve read, Roberts worked with F.J. Sage on the project, assisted by Townsend Whelen, A.O. According to Johnny Falk, in a letter dated in the last quarter of 1980, the information in the brochure " is still not ready for publication." The other prominent version is the .257 RCBS Improved, which features a 28° shoulder. It shoots 100 grain Speer bullets @ 3030 fps with 41.5 gr. For the record, every load was dropped from a RCBS powder measure just short of the target charge weight and trickled up accordingly. Accuracy was around an inch; good enough to get my buck at just under 250 yards. Ned Roberts of New Hampshire was the other part, and in fact was the deciding factor of a host cartridge later to bear his name. Hornady 046275 Full Length Die, 257 Roberts (.257") $25.25 $ 25. 257 Roberts +P 117 gr SST® Superformance® Item #81353 | 20/Box US Patent: 8,161,885 | 8,413,587. Noted gun and cartridge experimenter – Dr. Franklin Mann – was indeed a very important part of the .25-caliber concept. When it comes to sizing, I prepare all cases as if I was going to use them for hunting. 257 Roberts Load Data; 257 Roberts Ackley Improved Load Data; 25 Winchester Super Short Magnum Load Data; 25-06 Remington Load Data; 257 Weatherby Magnum Load Data; 6.5 Grendel Load Data; 6.5 Creedmoor Load Data; 6.5 X 55 Swedish Mauser Load Data; 260 Remington Load Data; 6.5mm-06 A-Square Load Data; 6.5-284 Norma Load Data ; 6.5 Remington Magnum Load Data; 264 Winchester … The .257 Roberts has (finally) been updated to piezoelectric pressure measurements, with standard pressure loads listed at 54,000 psi while +P loads are listed at 58,000 psi. In 1934, Remington Arms showed interest in the cartridge, changed the shoulder angle to 20 degrees and paved the way to full commercialization in the same year. For primers, stick to standard brands. My load is above Nosler's published load data but it is safe in my rifle. Either the 100 gr. One is a 50's Mauser with 22" raised-solid barrel and super fancy. Custom builders like Shaw Custom Rifles can help. 4.8 out of 5 stars 392. 340 … 117 gr bullets: Max loads: 50 gr RL 19: ≈2920 120 gr bullets: Max 49.5 gr RL 19: ≈ 2890 fps Also quite Elk-effective! 300 Weatherby Magnum. Magnum Mar 23, 2017 #2 6mm Remington Well-known member. The .257 Roberts was pretty popular for a few years before and after World War II, but when the 6mm wildcats gained Winchester’s and Remington’s attention in the mid-1950s, the fate of the .257 Roberts was sealed. Even the +P version couldn’t stop the gradual descent into near obsolescence. If you're unsure, or just want options, check as many boxes as you'd like. 1. The 257 Improved is a fi ne performer, adding up to 100 fps velocity over its factory cousin. It shoots 100 grain Speer bullets @ 3030 fps with 41.5 gr. Increase your rifle's performance up to 200 fps without extra chamber pressure, recoil, muzzle blast, temperature sensitivity, fouling, or loss of accuracy. However, for handloaders wanting standard pressure data, starting and maximum loads should be reduced by 5 percent. … If you really get in a bind, purchase some 7x57 brass, neck it down to .25 caliber and fireform it to your rifle. 257 Roberts. 300 Weatherby Magnum. 100 grain bullets at close to 3100 fps. It features a straight-grained walnut stock, a handy 22-inch barrel and fleur-de-lis checkering. I am shooting a 20" suppressed Ruger Hawkeye chambered in 257 Roberts. About; Disclaimer; Contact; Log in / Sign up.257 Roberts - Manufacturer Loading Data. LEE PRECISION 257 Roberts Gauge/Holder. Weldin of Hercules Powder Company. $108.07 $ 108. 264 Win. I full-length size all the cases, not just the neck, as I want to make sure they will work in the action. Since this was my first time out West for antelope, cartridge choice was an important consideration. As a matter of note, the cartridge at this time was used only in bolt, single-shot and pump guns.Elmer Keith was another .257 Roberts supporter of sorts. Recipes . Although MatchKing® and Tipped MatchKing® bullets are commonly used for varmint hunting, their … It’s simply too much fun to shoot! Group sizes and velocities are listed in the table. For reloading duties, I use Winchester Large Rifle primers that give excellent results. Ultra Magnum. I've loaded for 3 different .257 Roberts, two of them Ruger MkII. Nosler Inc  |  Privacy  Use  Order Processing. Looking back at my records, the handload used in Montana included Hornady 117-grain Spire Point bullets loaded over 42.0 grains of H-4350 at 2,599 fps. I am only stating what the numbers show. Ultra Magnum. 50bowhunter Active member. 257 Roberts Load Data Using Hornady reloading data with the 257 Roberts bullets creates … 07. 4.7 out of 5 stars 26. Its trigger broke at 3.25 pounds right out of the box. 257 Weatherby Magnum. Filter. If we take the Roberts with a 100-grain bullet at 3,000 fps and zero the rifle for 200 yards, bullet drop at 300 yards is only 7.2 inches. Short Magnum. 10 Posts . The Speer Manual, 13th edition contains a explanation of the 257 Roberts + P. Winchester's +P factory loads contain cases with thicker walls to accomodate the higher pressure loadings design for modern bolt action rifles. Cartridge. Pistol; Rifle; Cowboy; GR. Over years of using the Roberts on game from summer woodchucks to bigger game out West, I found this cartridge extremely adaptable to most powders in the medium burning range. 300 H & H Magnum. 257 Roberts loads. In a short action, it has the potential for a suitable youth rifle but without care towards optimizing hand loads, can lack the power with many 117 to 120 grain loads to be of any great advantage over the more common .243. While this is all well and good, the .257 Roberts deserves to be handloaded for use in the field. 257 Weatherby Magnum. Mar 29, 2008 #1 I am trying to work up a load for my bob I want to use 117gr round nose bullets . The sizing die is set to bump the case holder, then I try each case in the chamber of the Model 70. Winchester does not presently list the cartridge in any current rifle that I know of. We are currently populating the cartridge drop-down menu with updated cartridge renderings, new propellants and bullets, and links to complimentary product pages. 270 Win. It is appropriate for cartridges like the 257 Roberts Improved, 25-06, 257 Weatherby Magnum and 1x10" twist 250-3000 Savage. Then select your bullet weight, powder manufacturer and powder type. The company’s first rifle was the Model 30 bolt action. Ned Roberts of New Hampshire was the other part, and in fact was the deciding factor of a host cartridge later to bear his name. FREE Shipping. 300 Win. I have had real good luck and accuracy with both IMR and H 4831. 25. For this project, I explored many I did not have the opportunity to try in the past. From then until the introduction of the hot .243 Winchester and .244/6mm Remington in 1955, the .257 was the top selling combination varmint/deer cartridge. 270 Weatherby Magnum. 257 roberts load data, hybrid 100v 257 roberts, loading data for 257 roberts, sierra 257 roberts load data, sierra 257 roberts reloading data, sierra load data 257 roberts, sierra load data for 257 roberts, sierra matchking bullets load data 257. Hodgdon Benchmark and H-335 were neck and neck, with IMR-4895 following suit. IMR 4350 is an excellent powder for our hunting weight bullets. It is appropriate for cartridges like the 257 Roberts Improved, 25-06, 257 Weatherby Magnum and 1x10" twist 250-3000 Savage. AccuBond would be our pick for deer-sized game. Right click on the image of the load data and use save as. 260 Rem. The 257 Roberts is one of two .25 caliber cartridges used for daily production testing in the Nosler Ballistics Lab. John Barsness wrote an excellent article on reloading the 257 Roberts some years back. Open up the load data page you wish to download. It has been described as the best compromise between the low recoil and flat trajectory of smaller calibers such as the .22 and 6mm, and the higher energy but harder recoil of larger popular hunting calibers, such as the 7mm family and the popular .30-06. I have been working with a Ruger Hawkeye 257 Roberts and looking for suggestions for a good coyote handload with, hopefully some speed behind it. Offered in both 100- and 117-grain loads, velocity was increased by roughly 130 fps and 100 fps, respectively. As usual, some bullets grouped better than others, and most loads were accurate enough for field shooting. This cartridge is at its best when loaded slightly below maximum as the extra powder does not help accuracy, velocity or wear and tear on the rifle or shooter. 338 Rem. 264 Win. You can also click on the image and a pdf version will open in a new window. The plus Ps always gave higher average velocities but the average difference was around 2%. I used the Hogdon reloading data to get a starting point and worked up from there. New brass manufacturered today is designed for modern bolt rifles and load data. I for one limit my long-range shooting to 300 yards or less. The 257 Roberts uses the 1989 7.65x53mm Mauser or 7x57mm Mauser case head built with a large Boxer primer pocket and so is only good for handloaders to ~ 67 kpsi for long brass life with margins [in strong rifles]. The rifle was a Winchester XTR Featherweight that became available through a strange set of circumstances. roger 284 Win. The hottest .243 Winchester factory load I was able to identify for the article The .243 Winchester: Its Capabilities as a Deer Cartridge specs out as follows..243 Win. Noted gun and cartridge experimenter – Dr. Franklin Mann – was indeed a very important part of the .25-caliber concept. Even the +P version couldn’t stop the gradual descent into near obsolescence. 257 Roberts Modern Data Handloading, Reloading, and Bullet Casting : The Firing Line Forums > The Skunkworks > ... My main hunting rifle is a 257 Roberts in a Model 70 Featherweight. 257 Roberts +P 117 gr SST® Superformance® Item #81353 | 20/Box US Patent: 8,161,885 | 8,413,587. Varget seems to be a barnburner with a 75-grain bullet, so I tried 41.0 grains for a velocity of around 3,400 fps. 270 Weatherby Magnum. Joined Nov 4, 2014 Messages 1,532 Location Westen … Short Action Ultra Magnum. Did some testing today on .257 roberts, identical loads the only difference being the cases. Of course, you could have your rifle rechambered for the .25-06 Ackley which treads close on the heels of the .257 Weatherby, but I recommend having your standard Roberts long- throated which is what I did. In addition, Winchester and Hornady still turn out factory ammunition. There is no shortage of .25-caliber bullets. Posted By: jimmyp Re: Reloading for 257 Roberts - 05/03/17. The .257 Roberts is a better deer cartridge than the .243 Winchester. 270 Win. 4064. 260 Rem. They've all done great with H4895/75 Sierra hp or 75 V-Max. I own two, 257 roberts rifles. The 100 gr PT works very well from the 257 Roberts. The .257 Roberts is a low recoiling, mild powered cartridge. The Ackley obviously provides about 100 to 120 fps more velocity, but also prefers a 24" bbl.
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