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Old 06-21-2005, 04:40 PM
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375 H&H loads

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I am looking for some reloading data for my 375 H&H mag, I am using 270 grain and 300 grain Hornady bullets. The powders I have are IMR 4064 and IMR 4831. Thanks ,John
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Old 06-21-2005, 07:14 PM
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In my Ruger #1 I found that my best loads for 300 grain Hornady RN bullets is with H-414. 76 grains for soft points and 75 grains for solids.

I don't know why but the solids hit to the same point of aim at 100 yards using 1 grain less powder.

for 270 grain bullets try 82 grains of IMR-4831. This is a compressed load but is a good one.

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Old 06-22-2005, 06:09 PM
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.375 H&H loads.......

In a 24" M70 .......

66.0 IMR4064 FC mag primer 300 Sierra SP I get one hole accuracy at 100 yds and 2375 fps with very little deviation from shot to shot.

In todays 3400+ fps big game rifles this doesn't look all that impressive. But it has accounted for elk, kudu,wildebeest, water buck and a lot of smaller stuff.

The other load I use also with 300 gr bullets though Nosler Partitions is WW760. I think 76 or 78 grains. Anyway look up WW760 and give some a try. More velocity than 4064 and basically as accurate.

FN in MT
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Old 06-22-2005, 08:29 PM
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I too have found that Winchester 760 is THE powder in my 375 H&H. It gives accuracy as good as any other and the highest velocity. I mostly use Sierra 300 grainers. 78 gr. of 760 yields 2520 fps. Use the same charge with the 285 gr. Speer Grand Slam.
Here is data right from the Hornady manual for the bullets and powder you listed. No data for IMR4831 is listed.

270 gr.
IMR4064- 62.1 gr. to 70.2 gr. {2400-2600fps}

300 gr.
IMR4064- 62.2 gr. to 68.1 gr. {2300-2500fps}

Last edited by TedH; 06-22-2005 at 08:32 PM.
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Old 06-22-2005, 08:40 PM
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Join Date: May 2003
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375 H&H loads

Thanks those are the numbers I was looking for. The W760 looks like the one to try. Thanks gents and good shooting and hunting to you , John
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Old 06-23-2005, 06:25 AM
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Location: Western Wisconsin
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.375 H&H Magnum, Winchester brass, Winchester Large Rifle Primer, 25" barrel
Bullet; Powder; Maximum Charge; Velocity; Pressure
270 grains; IMR4831; 82.5 grains compressed; 2690 fps; 50,700 CUP
300 grains; IMR4831; 80.0 grains compressed; 2560 fps; 48,300 CUP
Source: IMR Powder
Reduce maximum load by 10% to establish a starting load and work up carefully toward maximum watching for signs of excessive pressure or velocity.

If its the highest potential velocity for 270 and 300 grain bullets you are looking for, the 4350s, both IMR and Hodgdon, will likely get you there. However, there are a bunch of powders that will give a good balance of velocity and accuracy. Obviously WW760 is one of them. I really get very good accuracy with H4895 with 270 and 300 grain bullets, and get 3000 fps and decent groups with 85 grains (MAXIMUM) of Hodgdon BL-C(2) under the 225 grain Hornady Spire Point.
You learn something new everyday whether you want to or not.

Last edited by jackfish; 06-23-2005 at 06:36 AM.
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Old 06-25-2005, 06:09 PM
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Join Date: Feb 2004
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I found a full article on the subject with a good listing of loads, variety of powders, primers etc, in the June 2003 edition of American Rifleman I think it was... anyone want the article scanned and sent to them just shout.
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