As for recoil, even out of my sub-six-pound MG Arms Ultra-Light , it is a mild push instead of a sharp crack like the .300 Wby., and it prints half-MOA groups all day long. I'm leaning to the 378 because of bullet selection - Cutting Edge has a .375, 375gr bullet with a BC of .940, where the .416 Cutting Edge 375gr is around .825. Nevertheless, cases were easy enough to form for those already in ownership of .375 Weatherby rifles. 378 Weatherby Magnum Developed 1953 / Produced 1955 Designed to replace the 375 Weatherby Magnum, deep penetration and bone smashing power are the calling cards of the 378. I would not suffer from the barrel burner problems of the large powder to bore ratio calibers such as the 378, 300, 240 Wby's or the RUM's. The 375 Weatherby is not an over-bore caliber. Founded by legendary hunter Roy Weatherby, Weatherby Firearms produces some particularly high-quality rifles like the Mark V and the Vanguard models. The .378 Weatherby outshone the former cartridge and by 1960 the .375, though very useful in its own right, was made obsolete. A custom 5″-long muzzle brake is fitted at the end. rookhawk. The .375 Remington Ultra Mag (RUM) is based on a blown-out .404 Jeffery case slightly shortened to the same 2.850" case length as the .375 H&H Magnum. 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. It is very well matched, powder capacity to bore diameter and its expansion ratio is quite high. I do know that the .416 Rigby case is only designed for around 52000 CUP and the 378 around 56000 - even though I've heard of people pushing the 378 to 65000 CUP. Any Rifle Chambered in .375, .378, .416 or .460 Weatherby Magnum. Yes, the .378 Weatherby will generate considerable free recoil, an average of 77 ft. lbs. 375 Weatherby Magnum 1947 This cartridge is the result of giving the “Weatherby treatment” to the legendary 375 H&H. The maximum cartridge overall length (COL) is also the same as the .375 H&H, at 3.60". Reactions: rookhawk. All barreled action work was done by R.W. Performance is superb across the board, but there are differences in ranging capabilities, … There are some shooters who can handle recoil extremely well. The recoil is just too much. It was superseded in 1953 by his .378 Wby based on a larger case. A 340 Weatherby although potent, is not a 378 Weatherby or 460 Weatherby(375 calibre +). from a 9 lb rifle. The .375 H&H, which celebrates its centennial, is a world-standard cartridge, but it's not the only .375. It is a .375 CheyTac (lengthened) built on a BAT 2.5″ action. Like someone posted earlier, Weatherby rifles sour some guides and PHs because previous hunters have come to Africa, Alaska, or on other big game hunts with brand new Weatherby rifles that they haven't learned to shoot and are afraid of, and have wounded or missed animals. Joined Mar 4, 2015 Messages 3,281 Reaction score 4,510 Location North America Media The .378 Weatherby is like a .375 RUM on steroids. The .375 Weatherby has been largely, but not entirely, superseded by the later .378 Weatherby. Snyder Custom Rifles. What's great about this chambering is that it will still digest factory .375 H&H as well as .375 Weatherby ammo. With his improved case shape, Weatherby made the original .375 H&H the .375 Wby in 1945. BUY NOW. The 375 Weatherby Magnum could be considered a version of the "375 H&H Magnum Improved" family. The 378 Weatherby Magnum was created as a new cartridge, with a larger case capacity and bolt face diameter. I have never seen a client who can handle either a 378 or 460 Weatherby with any form competence. AH legend. Not counting wildcats and proprietary cartridges, we have: .376 Steyr, .375 Flanged, .375 H&H, .375 Ruger, .375 Weatherby Magnum, .375 Remington Ultra Magnum and .378 Weatherby Magnum.. Only recently was the .300 Wby outclassed by the .300 Dakota, .300 Remington Ultra Mag and .30-378 Wby, all based on fatter cases. The custom 35″, 1:10″-twist Brux barrel is a fat, 2″-diameter ‘straight taper’ with fluting. Larger case capacity and bolt face diameter + ) it was superseded in 1953 by his.378 based., 2015 Messages 3,281 Reaction score 4,510 Location North America Media the.378 Weatherby is a! Either a 378 Weatherby or 460 Weatherby ( 375 calibre + ) a version of ``... Media the.378 Weatherby will generate considerable free recoil, an average 77. Was created as a new cartridge, with a larger case capacity and face... 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