To reach this speed, Weatherby first made a high volume case by modifying the then popular, belted 300 H&H Magnum. Talk about testing the market before taking the leap! .257” bullets? Therefore the higher impact velocity of the .257 Weatherby Magnum will—and in most instances apparently does—switch off a deer’s nervous system. Nosler Ballistic … The .240 Weatherby Magnum was developed in 1968 by Roy Weatherby.In the development of his own .240in/6 mm cartridge, Weatherby was significantly influenced by both the success and the limitations of the .244 H&H Magnum cartridge devised in England by his friend and colleague David Lloyd.It was the last cartridge to be designed by Roy Weatherby. Mag. Thousands of 257 Weatherby Magnum hunters have discovered a proper bullet properly placed spells lights out. Back in the first third of the 20th Century 25-calibers were quite popular. 264 Winchester-Mag Vs 257 Weatherby- Mag 06-14-2017, 08:57 AM From what i see the 257Wby is about 125fps faster, but the 264(6.5) Win had a greater choice of bullet weights. magnums. Niedner introduced rifles for his 25 Niedner, the 30-06 case necked down to hold a .257” bullet. .240 Weatherby Magnum. But if you really want to minimize 257 Weatherby Magnum ammo costs and maximize performance, you’ll want to handload. It was supposedly Roy Weatherby's favorite cartridge for everything, and I can sure understand why. If you’re looking for a mild-recoiling, flat-shooting, hard-hitting centerfire rifle you’ve probably overlooked in the past, look to the 257 Weatherby Magnum. Weatherby sells it, of course, and so does Hornady, Nosler, Choice Ammunition, Double Tap, and HSM. Though picking up a Wilderness or Accuguard in .257 would make sense I want to "try" a new cartridge in 6mm or .223 as it will be for predators and I simply have never owned anything smaller in caliber than a .257 (excluding rimfires). $18.03 $ 18. The results are bullets as long as a 1-10” twist barrel can stabilize. (There are some small bullet makers like Blackjack offering high B.C. Clearly the 257 is the ballistically superior round to 800-yards. The case often produces a one-foot flame—even in bright daylight—from the muzzle, caused from the excess powder burning outside the barrel. A wide non-typical with palmated main beams, it green scored 121 Non Typical B&C. Compared to the 25-06 Remington, the 257 Weatherby Magnum pumps out roughly 600 f-p more energy at the muzzle and 150 to 200 fps more velocity. Many 140-grain 6.5mm bullets (.264”) are exceeding .600 B.C. I can’t remember it ever missing, but if it did, it wasn’t the rifle’s fault. The light 87grain Hornady SP at 3825fps is intended strictly for varmints while the 100 grain Interlock at 3602fps and 117 grain RNSP Interlock … Choose the lowest price from our multiple warehouses. Why not make longer, sleeker, higher B.C. All Rights Reserved, Prior to the commercial ascendancy of the 25-06 Remington, however, there was the 257 Roberts. The year was 1915. numbers. (G-7 B.C. It’s obvious now how popular the .257 Weatherby is by the support of commercial ammunition on the retail level. This means we’ll zero so no bullet crests higher than 4 inches above point-of-aim. Mine said 351 yards. Ballistic Table . As we can see, the 257 Weatherby Magnum shoots much flatter than the Creedmoor. We’re sticking with published data. I think this may be an instance of ‘go-big-or-go-home’, in that the .25s are predominately deer/antelope/sheep cartridges, as they lack the bullet weight to make a sound choice for elk and moose. About eight years ago a Merkel single-shot in 257 Wby. Mag. And often in dramatic fashion, as the following ballistic data suggest. 270 Weatherby Magnum Developed 1943 / Produced 1945 Was one of the first Weatherby Magnums offered to customers. The 25-06 is limited to 63,000 psi, the 6.5 Creedmoor 62,000 psi. You could only buy it in a Weatherby rifle, not a Winchester, Remington, or Savage. Company Directory (307) 675-7800. As for energy, the 6.5 Creedmoor carries 1,000 f-p to just beyond 700 yards. To maximize B.C. Prior to the commercial ascendancy of the 25-06 Remington, however, there was the 257 Roberts. There are no flies on a good .25-06 Remington, but when it comes to the blazing quarter-bores, the .257 Weatherby Magnum holds a special place in the hunting fields. Cartridge Type: Rifle Height: 2.549" Width: 0.531" Average FPS: 3408 Average Energy: 2836 Average Gr: 110 Recoil: 1.76 Power Rank: 3.75 of 20 The .257 Weatherby Magnum was designed by Roy Weatherby in 1944 and was first introduced into the market during 1948. This translates to all sorts of hydraulic shock, which is the primary reason that proponents of the .257 Weatherby swear by the cartridge. As we can see, the 257 Weatherby Magnum shoots much flatter than the Creedmoor. In a shooting/hunting world obsessed with flat-shooting, wind defying, hyper-accurate, long-range rifles, cartridges that fire .257” diameter bullets have been overlooked. Invented by Roy Weatherby in 1944, it was his favorite cartridge as well. The .257 Weatherby is an overbore design, meaning that there is more powder in the case than can be burned in a conventional barrel length. The .240 Weatherby is the highest velocity commercially produced 6mm cartridge. Most .257” bullets top out at 120-grains, and at that weight even the really sleek, long boat-tail versions have a hard time breaking .450 B.C. I have 2-257 Weatherby's and a ULW 6.5-300 Weatherby, both are awesome cartridges for all the applications you mentioned. 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