.303 Brit IMR 4320 load

Butcherbill

Butcherbill

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About to do some further accuracy testing on a new to me No.4 mk1 and a 91/30 with some handloads, have a lb of IMR 4320 and figured it would be a good use of this now discontinued powder. After a bit of searching I found some load data in a couple older Lyman, Speer, Hornady manuals.

I know a few of you have used 4320 in .303 with good results, what powder loads have you found that worked well? 37.5gr-41.5gr seems to be the average start-max load range with hornady going as low as 34.3gr.

I’m mainly trying to see if I can improve accuracy with some more appropriate dia bullets that I have on hand (.311”-.312”) than work up a load, so I don’t want to use the other powder I have for this test. Seeing as I won’t be able to get 4320 outside of old stock it seems like an appropriate use for the lb I have, both .303 Brit and 7.62x54r list it as appropriate.
 
I am using 44 grains of IMR 4320 behind a 174/180 grain bullet for fabulous results.
However, a WARNING: I have a 1910 Ross that has been rebarrelled, and is a front
locking, very strong action, so start lower, please. Dave.
 
Eagleye said:
I am using 44 grains of IMR 4320 behind a 174/180 grain bullet for fabulous results.
However, a WARNING: I have a 1910 Ross that has been rebarrelled, and is a front
locking, very strong action, so start lower, please. Dave.
Click to expand...

Spicy! I found a picture of an old Sierra load book and the max load was 43.0gr, which is hotter than any other published data I’ve dug up so far.

I think I’m going to load the first five at 38.5 and bump up .5 grains and see if this barrel likes the .311 bullets, hopefully it does as I have a good amount them. I have a couple different powder options as well before I abandon jacketed bullets and start casting .312” bullets.
 
Here’s some of the data I dug up, the 4th pic has 44gr as a max, iirc this was from the Lyman 4th edition.

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