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Getting ready to start playing with some loads for my 375 H&H. One thing that surprised me was I had often heard that the 375 H&H was loaded to lower pressures than the normal shorter magnums. But it's standard is 62,000psi which is higher than the 7mm Rem mag and in the 61,000-64,000 range of most magnums. Anyway, this load will not be for dangerous game but more for big NA and maybe plains game. I was thinking about trying the 260Accubond or 260PT. Maybe a 270. First powders 4064 and RL15. Where does your experience tell me to start? As usual just my $.02 Paul K | ||
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IMR-4064 From 61.2 grains to 73.4 grains Remington 9-1/2M Primer | |||
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Yep, IMR 4064 works for me! Regardless of bullet weight a top performer.  Member NRA, SCI- Life #358 28+ years now! DRSS, double owner-shooter since 1983, O/U .30-06 Browning Continental set. | |||
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RL-15 has given me some amazing groups. Mike -------------- DRSS, Womper's Club, NRA Life Member/Charter Member NRA Golden Eagles ... Knifemaker, http://www.mstarling.com | |||
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While I consider 4064 my favorite powder, I tried some 4320 the other day and it worked really good. I started with 69 grs. and it shot well. Haven't finished load development with this powder yet, but the initial results were promising. Just my 2 cents worth | |||
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My original magnum Mauser .375 H&H prefers 70 grs. of IMR-4350 and the 270 gr. Hornady bullet over all else for accuracy. I would use a better bullet though, if using it for big bears or Afrika. My country gal's just a moonshiner's daughter, but I love her still. | |||
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Powders in the burn rate of 4064, RE15 and Varget will do the best for the 270s. Jay | |||
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RE15 has worked well for me. - mike ********************* The rifle is a noble weapon... It entices its bearer into primeval forests, into mountains and deserts untenanted by man. - Horace Kephart | |||
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Same here! DRSS member Constant change is here to stay. | |||
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I'm using rl-15 with 260 accubonds and accuracy is great. I'm recalling that 71 grains was my load, but please take with a grain of salt and work up in your Whitworth. Glad to hear that you finally found one. Bob | |||
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RL 15, 75.7Gr with 270gr Barnes XTS in my Mod 70 works very well. Please use caution & start low as each rifle is not the same. | |||
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RL 15 also listed as most accurate powder tested in Nosler manual 4. | |||
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I am 4350 guy for everything Mike Legistine actu quod scripsi? Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue.  What I have learned on AR, since 2001: 1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken. 2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps. 3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges. 4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down. 5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine. 6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle. 7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions. 8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA. 9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not. 10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact. 11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores. 12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence. 13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances. | |||
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Try RL15, 4064, and H414. If it won't shoot with those powders, chances are it won't shoot. I like the 270 North Fork with RL15, shoots 1 in. velocity is 2770 fps, About 72.5-73 grains with the North Fork, you can't use as much as with a Hornady, etc. This load will clobber elk, kudu, zebra, etc. A shot not taken is always a miss | |||
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My records for 260 Partition show 4350, 760, RL15 and Varget. Best group was with 72 gr of RL 15 at 2483fps. Kudude | |||
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Thanks Bob. Yep blind hog found the acorn. LOL Thanks guys. Sounds like I'm on the right track. I think I'll try Rl15 first with 4064 second and if those don't cut it try H414. Has anyone used the 260 Accubond on game? I've used them in my 7mms with excellent results. I have several BIG hogs down on the lease that will be a perfect test. If they hold up on a broadside shot on those big boars they should hold up for what I'll be hunting. As usual just my $.02 Paul K | |||
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Reloader 15 | |||
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I shoot a lot of .375 and I've had the best luck with 4064 and RL15. Mostly I've shot 300 grain bullets (in a couple different rifles) but I had one decent load for the Barnes X in 235gr. with 4064. I've never had much success with 4350... except some ammo that Mike Dettorre gave me that shot 1/2" (but I couldn't reproduce his accuracy). Kyler | |||
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Maybe in most rifles, but not in mine. I simply reported what, by actual test, does best in mine, which IS 4350. My country gal's just a moonshiner's daughter, but I love her still. | |||
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While I've never had the opportunity to chronograph my .375 H&H loads with ANY powder; I vote with either the H or IMR 4350 crowd, these two powders have always given me the best accuracy in my (2) .375H&H's. and that with either 260, 270 or 300 grain bullets. Cheers, Number 10 | |||
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Ramrod, I used 260 accubonds in Namibia on plains game in 2004. Good mix of penetration and expansion. I only recovered a few bullets, the lightest was at 50+% after plowing through both of a zebra's shoulders at about 45 yards. I think that's a real test of a bullet. The 2 others recoved retained about 70%, and one penetrated at least 4 feet on a wounded gemsbok running away. Texas heart shot ended up in the skin ahead of the front shoulder. I'm a believer. Bob | |||
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With 260 grain Nosler partitions and 270 grain Hornady's mine likes IMR4350 and H4350. Frank "I don't know what there is about buffalo that frightens me so.....He looks like he hates you personally. He looks like you owe him money." - Robert Ruark, Horn of the Hunter, 1953 NRA Life, SAF Life, CRPA Life, DRSS lite | |||
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I wish we had the powder choice! | |||
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I use H4831SC in my 416 Rigby with great success. Is there a reason why I wouldn't use the same powder for my 375 H&H? "There are worse memorials to a life well-lived than a pair of elephant tusks." Robert Ruark | |||
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Only reason I could think of is the Rigby is more capacity to bore size than the 375. So slower powders might be better for it. As usual just my $.02 Paul K | |||
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H4350 will reach the velocities you need and do a good job of filling the case. | |||
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I have just recently aquired a 375HH a few months ago, and have had very exceptional accuracy with Winchester 760. I have shot the 300gr Hornady RN and the 270gr Barnes TSX, and 760 grouped them well, under and inch, without pressure, with good velocity. | |||
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I don’t shoot .375 currently but when I did the only bullets available were the old original 270gr and 300gr. I chrono’d some R-P and Win factory loads and found; R-P 270gr RN 2660fps Win 270gr SP 2750fps ( This load really woke ya up..) I pulled a Win 270gr load and weighed the powder charge and it was a odd grayish extruded powder that weighed out at only 64 grains! As I recall, the only way I was able to safely duplicate that velocity of 2750fps with 270gr bullets was to use a max load of IMR4350. IMR 4064 was very good also that would get me into the 2600’s with 270gr bullets. I find it odd that there was very little mention of 760 here.. 760 was very good, accuracy and velocity wise, in the .375 with both 270 and 300gr bullets. Although to see so much mention of Rx15, it must be excellent.. I can’t recall if it was available back then or it just came out the word hadn’t got out as to how good it was in the .375.. Why do they call it common sense, when it is so uncommon?? | |||
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H4350 (NOT IMR 4350 -- they are significantly different) gives both the best velocity and accuracy in my 375 H&H (Remington 700) with its 24 inch barrel. I use Winchester brass and WLR (Winchester non-magnum) primers. Hodgdon's data (in their older manuals) gave loads for both 270 and 300 grain bullets with this combination that resulted in compressed loads. Those compressed loads of H 4350 gave me the best results. I've tried the things that others recommend, 4064, H 414, and so on. I'm not impressed, except that IMR 4064 did give me a very accurate load with 270 grain bullets. Those powders are too fast burning, in my opinion, to give optimum results in the .375 H&H, especially with 300 grain bullets. "How's that whole 'hopey-changey' thing working out for ya?" | |||
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