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  Getting more mileage from your .375 H&H

ReloadingI've been toying with getting more mileage from my .375 H&H rifle. While I have developed some good hunting loads with several different conventional bullets, I wanted a cheaper, reduced recoil load that I could use for both hunting deer or just having fun at the range. Casting my own bullets was an obvious starting point as they work out at a fraction of the cost of conventional commercial bullets.

After significant development, I have finally settled on the following load:
Projectile: Cast from wheel weights plus 2% tin. Molded in a Lyman 375449 Mold and water quenched then aged for 3 months (not sure if ageing makes any difference). Lubricated with Lyman Orange Magic lube and using a Hornady gas-check.
Powder: 50.0 grains AR2206H (identical to H4895)
Primer: CCI magnum
Case: Winchester
C.O.L: 88.5mm
Averaged Velocity: 2133 fps
Accuracy: shoots 1MOA consistently - a nice load!
This load shoots exactly 3.0MOA lower than my normal hunting load using conventional bullets. No sign of leading in my rifle at all. This load feels about the same as a 180 grain .3006.
Yet to try this load on deer but I intend to once the weather improves.

Also developed a subsonic load for the .375 H&H.
This load comprises:
Projectile: Cast from 100% lead. Molded in a Lyman 375449 Mold and air cooled only. The aim is to achieve a soft projectile. Lubricated with Lyman Orange Magic lube and using a Hornady gas-check.
Powder: 13.0 grains Trailboss
Primer: CCI magnum
Case: Winchester
C.O.L: 88.5mm
Averaged Velocity: 1033 fps
Accuracy: shoots 1.5 MOA
Using a Gunworks Maximus supressor, this load makes the same amount of noise as a .22LR subsonic round fired with a suppressor. I'm yet to try this load on game.

Shoots clean with no sign of leading in my rifle. This round drops 14MOA compared to my conventional hunting loads, however, there is no deviation left and right.

While developing this load I tried a range of Trailboss powder weights from 25.0 grains to 11.0 grains using the same 100% lead projectile, case, primer, lube, and C.O.L.
I recorded velocities for loads less than 19.0 grains Trailboss. Average velocities were:
19.0 grains Trailboss - average velocity of 1277 fps Group approx 6MOA
18.0 grains Trailboss - average velocity of 1230 fps Group approx 2.5MOA
17.0 grains Trailboss - average velocity of 1227 fps Group approx 6MOA
16.0 grains Trailboss - average velocity of 1171 fps Group approx 6MOA
15.0 grains Trailboss - average velocity of 1128 fps Group approx 6MOA
14.0 grains Trailboss - average velocity of 1073 fps Group approx 6MOA
13.0 grains Trailboss - average velocity of 1033 fps Group approx 1.5MOA
12.0 grains Trailboss - average velocity of 978 fps Group approx 2.5MOA
11.0 grains trailboss - average velocity of 921 fps Group approx 2.5MOA

Groups comprised 3 shots and there seemed to be an improvement in group size at around 13.0 grains Trailboss. All rounds shot cleanly with no sign of instability in my rifle.

Next task will be to further refine this load with smaller powder increments between 13.0 - 14.0 grains Trailboss.

Posted by Waimahana on Wednesday, October 12, 2016 (16:34:29) (1105 reads) [ Administration ]
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