This cartridge is the result of giving the “Weatherby treatment” to the legendary 375 H&H. The classic double-radius shoulder is there, as is the H&H belt—though not unlike the .338 Winchester, the belt is only there for show as the .340 headspaces off the shoulder—and though the .375-inch-bore diameter is legally required for dangerous-game hunting in many African countries, when loaded with a premium 300-grain bullet, the .340 Weatherby Magnum is a serious cartridge. The cartridge is blown out, ... choice for those who want a step up in performance over the .375 H&H Magnum without the recoil or cost of the .378 Weatherby Magnum. 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. Roy Weatherby’s 378 delivers 34 percent more energy at the muzzle than the powerful 375 H&H Magnum. With his improved case shape, Weatherby made the original .375 H&H the .375 Wby in 1945. 375 Weatherby Magnum 1947 This cartridge is the result of giving the “Weatherby treatment” to the legendary 375 H&H. Many wildcats and the .375 Weatherby Magnum have the body taper removed and have a sharpened shoulder angle, increasing case capacity and velocity. 375 H&H instead of 375 or 378 Weatherby, 416 Rigby instead of 416 Weatherby, any 458 Lott instead of 460 Weatherby! My understanding is that the Weatherby version of the 375 is a little more on the lines of the Ackley Imp version of the 375. Hornady Superformance 162 gr SST was closest to … One has a thicker barrel. If you are rechambering an H&H rifle either will work. 40^o--141 " 378 WBY-----175 grains As you can see the capacity of the improved and the 375 WBY are very close. What's great about this chambering is that it will still digest factory .375 H&H as well as .375 Weatherby ammo. After many years out of production, the 375 was reintroduced in 2001. The … While the .375 H&H wears the crown for the bore diameter, there have been challengers. This was introduced as a Weatherby proprietary cartridge in 1953. AH elite. Nevertheless, cases were easy enough to form for those already in ownership of .375 Weatherby rifles. 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.. B. bruce moulds. I’ve seen spare .375 H&H ammo in almost every African camp I've been in, and it was very popular among the Australian buffalo guides. 30-378 Weatherby Magnum Produced 1996 The 30-378 was designed & tested in … Performance. Technically you can fire form standard ammo in either chamber. The Weatherby will do everything and maybe a bit more than the Ruger if that is important to you. Well, I am glad that what I did fear was some the reasons for these has to to with the user, not the gun and also to that Weatherby did use poor bullets, a good bullet in 375 H&H may not be a good bullet in a 378 WM, same to be with a 450 NE vs a 460 WB. The .378 Weatherby is a larger case, being the .460 Weatherby or .416 Weatherby case necked down to .375. Founded by legendary hunter Roy Weatherby, Weatherby Firearms produces some particularly high-quality rifles like the Mark V and the Vanguard models. Lastly, I must admit I was never impressed with Ackley. BUY NOW . In 2001 the Weatherby arms company made the decision to revive their classic cartridge by once again producing factory ammunition. Some of these are more powerful than the .375 H&H and some about the same or somewhat less powerful. The recently introduced .370 Sako Magnum, actually a 9.3mm (.366"), was intentionally misnamed to appeal to the American market. By enlarging the case to hold more powder, Roy Weatherby was able to achieve 200 more fps than the respected Holland & Holland version. As one can argue that the .338 and .375 are extremely versatile cartridges for anything worldwide, the Weatherby variations make it even more so. Also it’s a good shooting rifle, mine will shoot three well under an inch. Joined Aug 10, 2018 Messages 2,331 Reaction score 3,001. It was superseded in 1953 by his .378 Wby based on a larger case. The 375 H&H can be rechambered to 375 Weatherby inexpensively allowing the use of both rounds. on steroids, the .378 is the .375 H&H on steroids. Dec 31, 2013 #10 L. longestrange … The .378 achieves Roy Weatherby’s goals in every way. Try finding ammo for your "AI" in Africa or for that matter ANYWHERE in the US if the airlines gooned up your luggage. The .375 Weatherby has been largely, but not entirely, superseded by the later .378 Weatherby. With the right bullet, the .30-378 approaches the .338 Lapua, and bullet choice is critical. 375 Impr. The .458's, Winchester and Lott, tend to be very gentle in comparison. I foubd a 375 Weatherby that I sorta liked and would like to hear a little more about them. I have used 350 grain and 380 grain bullets with great success but I prefer 2300 to 2400 fps for DG hunting. During the 1960’s, U.S gun writer Elmer Keith and Bob Thompson created the wildcat .338-378 by shortening the .378 case slightly and necking it down to .338”. Most recent experience with factory loads (most of my guns never see factory ammo) is with a friend's 7mm RemMag. 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. 1960 the.375 Weatherby has been largely, but not entirely, superseded by the later.378 Weatherby outshone former! Shoulder angle, increasing case capacity is: H & H rifles ZKK! 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