Hello,

Anyone have experience with IMR 4451 in the 375 H&H?

I started working with it because I found 4 pounds of this powder.

Hodgdons lists the maximum with a 300 grains bullets at 74.5 and 74.7 with a 270 grains.

Right now I'm at 75 grains with at least 3 different 300 bullets and accuracy averages around an inch at 100 yds. Speed is around 2530 fps. Below this powder charge, accuracy was 2-3 inches groups.

I also tried 76 grains with a Barnes 270 grains TSX and got MOA accuracy on the first try.

I know I'm over Hodgdon's max but my Winchester Model 70 Safari have a very long freebore and I've noticed that Hodgdon's data for the 375 H&H are on the conservative side.. I got absolutely no signs of pressure.

I'm working some load for a Cape buffalo hunt.






Last edited by Qc_BearHunter; 11/17/21.
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