The author analyzed six .338 caliber magnum cartridges (.338 Winchester Magnum, .340 Weatherby, .338-378 Weatherby, .338 Remington Ultra Mag., 33 Nosler, and .338 Lapua) for trajectory, effective range, and recoil with modern ballistic software available free online from shooterscalculator.com. Do not forget that rifle weight is a crucial factor in the recoil equation, inversely proportional to recoil. This compares to 20 ft.lbs from a rifle chambered for .30-06 Springfield, but is only 10% more than the recoil of the .375 H&H Magnum while having 22% more energy. Driving a 250-grain bullet to 2940 fps, for over 4,800 ft.-lbs. There are some shooters who can handle recoil extremely well. * Yes you can reload it to lessen the Recoil Energy, but Performance, and Impact Energy will suffer. Caliber/Gauge: 30-378 Weatherby Magnum. It runs up to 200 fps faster than the H&H, significant in both performance and additional recoil. Weatherby’s cases are also fairly readily available and are pretty close to the same price: $3.50/case for 338 Lapua vs $3.50/case for Weatherby 338-378 depending where you pick them up from. Calculations were corrected to standard temperature (59F/15C) … Weatherby then set about designing a .375 caliber cartridge of extreme power. The 378 Weatherby Magnum was intended to replace the 375 Weatherby Magnum, which did not yield enough additional power over the 375 H&H. Recoil is severe, particularly in the relatively lightweight factory rifles often chambered for these cartridges. The .338-378 Weatherby Magnum started out as the wildcat cartridge, .338-378 Keith-Thomson Magnum during the early 1960s.Keith and Thomson are Elmer Keith and R.W. well writen. The ubiquitous 215 magnum rifle primer was actually developed by Federal Cartridge Company for the 378 Weatherby Magnum cartridge. Is it much worse than a Remington 870 express super magnum (7 1/2lbs) shooting 3'' slugs or buckshot? The .338-378 has a nasty recoil compared to the 338LM, too. Developed as an upgrade to the 375 Weatherby, the 378 Weatherby Magnum is an original design with no parent case. First time I saw Magnum's Magnum was article by Bog Hagel in a Wolfe publishing book. I just found this out, my uncle had apparently been planning a trip to africa once, and bought this rifle, and now just telling me. I also own a custom .300 UM and I love it, but the ballistics are really closer to a .300 Weatherby magnum than a 30-378. The 215 magnum rifle primer was developed by Federal specifically for this round. Increase the gun weight by, say, 25% and the recoil goes down by 25%. I suspect the 300-378 weatherby magnum has too much recoil for 95% of shootes. Please Select Pilot and Reamer Type: Reamers are available in Carbide for production run needs.Please contact a sales associate if you have any questions or if you would like to order a carbide reamer. Other magnum cartridges like the 30-378 Weatherby Magnum and 300 WSM have come along since then, giving hunters looking for serious magnum performance no shortage of options to choose from. Barrel Length is 23 1/4” ...Click for more info The .375 Weatherby Magnum, developed by Roy Weatherby in 1944, is an “improved” version of the .375 H&H, meaning the body taper has been removed to increase powder capacity. Roy Weatherby’s 378 delivers 34 percent more energy at the muzzle than the powerful 375 H&H Magnum. What would the recoil of a 30-378 Weatherby Mag with a 200grain bullet loaded at full pressure be like in an 8 pound rifle?Because I just had a rifle made at this weight and it has no brake!What can I expect when I pull the trigger.-----Death Comes To Us All. The .378 Weatherby Magnum was designed by Roy Weatherby in 1953. Thanks JB very nice article. The Contestants. The 375 Wby Mag is simply the 375 H&H fire-formed to greater capacity by straightening out the cartridge walls. Calculations were corrected to standard temperature (59F/15C) … I saw the post on the .300 win mag recoil, what is the recoil like on a .300 weatherby mag? .30-378 Weatherby Magnum History Based on the giant .378 Weatherby case, the .30-378 Weatherby was designed as a wildcat cartridge by Roy Weatherby … Less than 5 in stock Item #: WYH378300FJ ... Weatherby Brass 378 Weatherby Magnum Unprimed Box of 20 . Try 12 or 10 gauge shotgun (not semi auto) with 3" slug full load. While still unreleased to the public, the cartridge went on to set world records for accuracy including the first ten 10X in 1,000 yards (910 m) benchrest shooting. It was an original belted magnum design with no parent case, inspired by the .416 Rigby and headspacing of the belted .375 H&H Magnum. The cartridge can hold upwards of 7.13 g (120 gr) of powder.The 378 Weatherby Magnum cartridge also … * * According to the Rifle Recoil Table the .378 Weatherby Magnum shooting a 300 grain bullet at 2900 Feet per second has a Awesome Recoil Energy of 71.1 out of a possible Maximum Total Recoil Energy Score of 100. *, Alot, but with the right recoil pad nothing ujder .50 bmg is really TOO much, if it kicks too much, just add morenpadding to the recoil pad. It was the title of the article on the 378, your welcome to use mine if you in Denmark some day :-), If this is your first visit, be sure to Do you like hunting? The .30-378 Weatherby Magnum is a .30 caliber, belted, bottle-necked rifle cartridge. The cartridge was developed in response to a US Army military contract in 1959. Or any 12 gauge. In the table below rifle weight is given in pounds, free recoil energy is given in foot pounds, and free recoil velocity is given in feet-per-second. 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