The .257 Weatherby Magnum dates back to 1943, when Roy Weatherby began experimenting with the .300/.375 H&H Magnum case for a series of wildcat cartridges, most of which later became proprietary and today are SAAMI standardized. Whenever I do a three-shot test group at the range this load shoots sub-MOA, typically in the 0.6 to 0.9 MOA size. Fired at sea level, 10 mph right angle wind. Son of a gun, the Hornady brass still wouldn’t allow the action to close. As with most Weatherby Magnum’s, there are a few points to keep in mind when loading this cartridge. It is based on a Sako magnum action. Had to stop using 115 VLDs because rough throat combined with 3 groove began to damage VLDs causing poor groups with occasional flyers. Accuracy and terminal performance are the cornerstones of Hornady ® Precision Hunter ® factory loaded ammunition. The chambers have “freebore”, meaning they have a longer throat. Ballistic Table . I resized all my brass (both the Weatherby and the Hornady brass), tumbled it until the stuff glistened, and then tried to chamber it. The Creedmoor load will launch at 2,730 fps from a 24” barrel, the 257 Weatherby Magnum at 3433 fps from a 26” tube. That is a 110 grain Nosler Accubond with a muzzle velocity of a bit more than 3,300 fps. Earlier this week, I decided to load up a bunch of .257 Weatherby Magnum ammo and work on finding the secret sauce for an accurate load. I've never used military surplus powder; I probably ought to try it sometime. For this reason, it is generally not possible to seat a bullet close to, or in contact with the lands (rifling). IMR 7828 should be a good powder to try though my load of choice is with RL-25. 257 Wby Magnum 110 gr ELD-X ® Precision Hunter ® Item #81364 | 20/Box . Gunpowder Charge Weight Velocity m/s Velocity fps; Norma MRP: Max 75.1 Min 71.0: 1146 1018: 3760 3340 Originally, Weatherby .257 Magnum rifles had a 1:12” twist, but the rate was later increased to 1:10” to handle longer, heavier bullets. I do see IMR 4831 as an accuracy powder in the 257 Weatherby Mag load for data, for certain weights -mostly the lighter bullets. The following data was developed in a custom rifle built by August Francotte of Belgium. 257 WEATHERBY MAGNUM. The rifle has a heavy barrel of 25 inches. Great care has been given by Hornady engineers to develop superior, match­-accurate hunting loads that allow the ELD­-X ® bullet to achieve its maximum ballistic potential. It also has Weaver 4-16X scope mounted in an EAW rings and bases. 257 Weatherby: 28" #5 fluted SS Lilja 3 groove barrel, moly coated 110 accubond, .015" off rifling. This afternoon I loaded another 10 rounds of what is my current standard hunting load in my 257 Weatherby Magnum. Alliant Reloder 26 Weatherby CCI 250 59.3 2901 65.9 Vihtavuori N560 Federal CCI 250 60.0 2963 64.0 Alliant Reloder 23 Weatherby CCI 250 60.8 3031 64.2 Hodgdon Retumbo Federal CCI 250 65.0 2948 69.0 Alliant Power Pro 4000-MR Weatherby CCI 250 56.9 2920 61.9 IMR 7977 Weatherby CCI 250 62.1 2875 68.9 Alliant Reloder 22 Federal CCI 250 59.0 2904 63.0 Most belted mags headspace on the shoulder - not the belt. We’re sticking with published data. Not sure if that bullet could handle the strain, might come apart. Once I have the rifle in my hands, and determine the twist rate, Ill get a better idea of what should work. The older Weatherby rifles also had 3/4-inch of freebore, but the throating of all Weatherby rifles was changed in 1967 - 1968 to about 3/8-inch. We used the Winchester large rifle magnum primer in Weatherby brass throughout our tests. I don't think using necked down 270 Weatherby cases will be a problem. 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