Reloading recommendations for 375

shphtr

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Jul 7, 2006
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Alaska
I will be backing my son up for a once in a life time brown bear tag for Red Lake on Kodiak. I plan to shoot 270 gr Hammer Hunters but have available a limited supply of med to med/slow powders. My first choice would be H4350 followed by W760 neither of which I have. I have an abundance of H4831 which Ken Waters suggests could be appropriate. I will be shooting a 375 Weatherby in a pre-64 Win M70 with 22” barrel. Does anyone have any experience/recommendations for this particular combination of caliber/bullet/powder? Just in case, I have filed off the front sight.
 

MagnumManiac

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Feb 25, 2008
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I shoot a 375 Bee, other than those 2 powders you mention, the only other powders I have used are RE15 and RE17.
According to my sources, 96g if H4831sc is max with a 270g bullet. But seeing as though you’re using a Hammer, it may be more or less than this, I am not sure TBH.
Sorry I couldn’t be more helpful, but H4831 is my least used powder, never have liked it.

Cheers.
 

shphtr

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Jul 7, 2006
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269
Location
Alaska
My experience with H4831 is quite limited but apparently some have had good results with in some calibers/loads: temp stable, accurate in some calibers and for me at this time available. 96 gr is what I came up with also but unknown is Hammer bullet.
 

memtb

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Dec 30, 2013
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Winchester, Wy.
I am using RL 17 in my .375 AI, pretty much a twin to the Weatherby, getting excellent results with the Barnes 250 TTSX.

When/if I ever find some Barnes 270 LRX’s......RL 17 will be my first powder to try!

Good Luck, hope you can get it squared away soon! memtb
 

Murtfree

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Aug 27, 2019
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Pennsylvania
I’m using RL16 with 300 grain Accubond and getting phenomenal accuracy in my 375 AI, a gun that always gave me trouble prior to this combo. I am getting 2780FPS and have booked an Alaska Penninsula Brown Bear hunt for Fall 2023
 

Marine sniper

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Sep 11, 2005
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Washington State.
I think 4831 is to slow for a 375 Wby, it was in mine. I got best results with 4350.

24 in barrel / 215 primer / 300 Swift A-frame / IMR 4350
82: 2527 / 2528 / 2527ES= 1ave: 2527
82: 2512 / 2528 / 2503ES= 16ave: 2514
82.5: 2536 / 2549 / 2540 ES= 14ave: 2541
83: 2536 / 2561 / 2574ES = 38ave: 2557
 
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