Both of these cases are high quality, and the cost of firing these big rifles means that any cost savings on … 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. He wants me to shoot it, to see if I can handle it, and if I can, he is going to give it to me. The 215 magnum rifle primer was developed by Federal specifically for this round. 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. The 338-378 Keith-Thomson Magnum is a quarter of an inch shorter than the full length 338-378 Weatherby Magnum, this was because they thought it was better balanced with the slowest powder generally … 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. 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. Thanks JB very nice article. This round is pushing a 130 grain bullet at a screaming 3,476 feet per second (fps) muzzle velocity. 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. would you feel comfortable in bear country with a 5.56 loaded with green tip ammo? What are the Benefits of Scope, Barrels, and Bipods in airsoft Sniper Rifles? Weatherby Firearms has continued the tradition of high-velocity, flat-shooting cartridges when the company released the 6.5-300 Weatherby Magnum in 2016. However, Weatherby took the discussion to the next level and has bridged the gap, so to speak, enter the 6.5-300 Weatherby. However, for the shooter who wants to create "cartridge envy" in the minds of his or her peers, the .300 Remington Ultra Mag and .30-378 Weatherby Magnum are hard to beat. Do you like hunting? Calculations were corrected to standard temperature (59F/15C) … One of our members, Wbypoor (Glenn), has added his wealth of experience with the .378 to this article supported by 30 years of use, which is more than anyone I know of and, as co-author, certainly adds considerable depth and breadth to this important cartridge in the Weatherby line-up. Do not forget that rifle weight is a crucial factor in the recoil equation, inversely proportional to recoil. 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. * Being a traditional .30-06 guy, this is a mind blower and potential game changer of a round. Calculations were corrected to standard temperature (59F/15C) … Weatherby then set about designing a .375 caliber cartridge of extreme power. If you look at a chart put out by Remington you will see better ballistic information based on the .300 Weatherby ammo that they load. well writen. The Contestants. Is their any way I can reload it, or make a "light Load" that doesn't have AS much recoi? The .338-378 has a nasty recoil compared to the 338LM, too. Try 12 or 10 gauge shotgun (not semi auto) with 3" slug full load. Recoil is severe, particularly in the relatively lightweight factory rifles often chambered for these cartridges. So naturally the .300 UM will outperform the .300 Weatherby according to Remington. Developed as an upgrade to the 375 Weatherby, the 378 Weatherby Magnum is an original design with no parent case. 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