IvW
AH ambassador
- Joined
- Dec 20, 2016
- Messages
- 6,711
- Reaction score
- 16,232
- Location
- South Africa
- Media
- 68
- Articles
- 3
- Member of
- BASA, CHASA
- Hunted
- South Africa, Zimbabwe, Mozambique, Botswana, Namibia,Zambia
My son and I rechambered our very light (7.25 lbs with scope) Rem XCR II in 375 H&H to 375 Weatherby. The motivation really was quality control from Remington or lack thereof. It came with an extractor too large to chamber factory Rem 375 H&H ammo and when I took it to the gunsmith I found out the chamber wasn't exactly perfect either. So I had a Sako extractor installed and had it rechambered to 375 Weatherby. It's been a great gun ever since. It's a bit snappy with 300g bullets at 2800 fps, but shooting factory 375 H&H rounds (300g at 2500 fps) it's a pussycat. It's very accurate with either load. Got my first brown bear with it at 13 yards so really didn't need the reach of the 375 Weatherby, but for long elk or eland shots it's there if you need it.
As far as speed not killing, given the choice between being shot in the shoulder with a 25-20 or a 257 Weatherby Mag, I'm thinking I'm picking the 25-20
As for "Improving" the 375 H&H(the King of the medium calibre's), it does make sense IF-you do so to gain a bit more case capacity to keep chamber pressures down when loading the super heavy weight bullets. We have a locally made 380 grain 375 H&H bullet designed specifically for buffalo hunting. In the standard case and with our local powders you can get realistically 2200 Fps. If you would like to increase that to 2300 Fps which is a superb speed for dangerous game hunting, it would make sense to increase case capacity in order to achieve that. The best option is to then go the AI route as you can still shoot standard ammunition in an AI chamber. This will give you roughly 9% more case capacity.
If you increase case capacity purely to shoot 300gr bullets faster this is the wrong way to go as the 300 grain bullet in the standard 375 H&H loading is going fast enough at 2500 Fps.
I have two 375 H&H rifles and have been considering to do the AI conversion or alternatively to re-barrel to 404 Jeff. I may well first do the AI chamber and see how that works out with the 380 grain bullets.