In looking at the reloading data, the 7mm is pretty anemic for a mag. The Beginnings The major difference between the two, is the design of the rifle chambers. It was developed in the 1940s by Roy Weatherby.The 7 mm Weatherby Magnum did not get a lot of exposure until the early part of the 1950s when the Weatherby rifles became more available. The .270 Weatherby Magnum was the first belted magnum based on the .300 H&H Magnum to be developed by Roy Weatherby in 1943. 28 Nosler Ammo. Cartridge Type: Rifle Height: 2.549" Width: 0.531" Average FPS: 3335 Average Energy: 3333 Average Gr: 135 Recoil: 2.05 Power Rank: 4.5 of 20 The .270 Weatherby Magnum was designed in 1943 by Roy Weatherby. It's too tight of a squeeze for me. By David E. Petzal. The following ammunition cartridge ballistics information and chart can be used to approximately compare .270 WSM Winchester Short Magnum vs 7mm-08 Remington ammo rounds. It is based off the parent case of the belted .300 H&H Magnum by narrowing the neck to accept the .277 inch (7mm) bullet. 28 Nosler Brass.280 Remington Brass.280 Ackley Improved Brass The old 7mm Rem. Re: 270 Wby Mag VS 6.5 300 wby « Reply #19 on: January 12, 2016, 08:38:49 PM » I've noticed on these 6.5 ballistics that no matter the starting/muzzle velocity that the 1000 yard velocities are really close.Stair stepping down of course but only about 80 fps drops at 1000 compared to 200-250 fps starting velocity differences. By Ron Spomer. For me, in British conditions, shooting at less than two hundred yards, that one extra cartridge trumps ANY velocity advantage that the Weatherby (or 7mm Remington Magnum) has over the 270 Winchester or 280 Remington. Reproduction in whole or in part without permission is prohibited. The .300 Weatherby Magnum is a fast, hard-hitting cartridge, driving a 180-grain bullet to a muzzle velocity of 3250 fps, for over 4,000 ft.-lbs. To me the two mags are ballistic twins and come into their own with heavy bullets. This email contact address is not an "Ask the Firearms Expert" service. The .300 Weatherby Magnum has a longer case length of 2.825" (71.76mm). Apple | iHeart | Spotify | Stitcher.300 Win Mag vs 7mm Rem Mag: History. I just did not see the gain in preformance to justify the cost. If you have a firearm related question, please register and post it on the forums. Though the .270 Winchester and .30-06 Springfield are both wonderful cartridges that have been incredibly popular with hunters since they were first introduced at the beginning of the 20th Century, gun designers never stopped looking for ways to improve upon the performance of those two old war horses. A Bonnier Corporation Company. When loaded to a velocity of 3100fps with a stout 160gn bullet , the .270 is just as effective on larger game as the 7mm Weatherby magnum loaded with the heaviest bullet available in that calibre. In fact, those two cartridges are likely among the Top 10 best selling rifle cartridges in the United States each year. the 7mm rem mag is just about usless, its to short, compair a 7mm rem mag to a 280 rem, they have nearly identical ballistics, the 7mm isnt worth the extra weight, or recoil, get the .270 wby, that is a very good round, far superiour to the remington. Before the .270 WSM, the most notable cartridge with performance exceeding that of the .270 Winchester, in the .277 bore size, was the .270 Weatherby Magnum. Shop Nosler Products. I still hunt with my old 270-Winchester for deer & antelope every year. 270 vs 280 vs 280 AI vs 7mm Rem Mag Ammo Selection. Latest. Calculations were corrected to standard temperature (59F/15C) and pressure … In 2004 I took my 99 .270 WSM and a light .375 H&H. All rights reserved. These include the .257, .270 and 7mm Weatherby Magnum cartridges. The 7mm Weatherby has almost identical case capacity to the 7mm Remington Magnum. A turbo-charged version of the popular 270 Winchester. Many products featured on this site were editorially chosen. Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent. Anything the 270-WSM can do the 270-Weatherby can do better. .270 versus 7mm Rem Mag. vs. .28 Nosler vs. 7mm RUM. of energy at the muzzle, it is far ahead of the .30-06 Springfield and .300 H&H Magnum. Ideal for long-range, medium size game. Mag. While I don’t have access to the official sales numbers, according to Weatherby, Roy’s .300 Weatherby Magnum is the most popular of the bunch. Nosler 160 grain AccuBond bullets in 7mm. Subscribe. Tell him to look at the 270-Weatherby before he commits to the 270-WSM. I believe that the .270 WSM has been successful because it performs at a level somewhat above that of the .270 Winchester (when fired from a 24" barrel), although it falls well short of the .270 Weatherby. This email link is to reach site administrators for assistance, if you cannot access TFL via other means. The cartridge is short enough to function in standard-length long actions with a brass length of 2.549" or 64.74mm and an overall length of about 3.295". I went back to the .308 until I went to Africa again in late 90s and then 2004. in 99 I took a .300 Weatherby and a .375 Weatherby. Well the .277 caliber bullets up to 150 grains with a modern (SPBT) design are just as good if not better than the .284 in ballistics. The ballistic performance based off four grains for velocity is 3,528 ft/s (110 gr), 3,338 ft/s (130 gr), 3,… Mag. Stretch out to 400 yards—not uncommon in mule deer country—and the differences are beginning to add up, but the drop difference between the .270 Win. Your reloads won't compare to the factory ammo. Mag., the new .28 Nosler, and the over-the-top 7mm RUM—a shoot-off to find the best. 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