I didn't use the cartridge full potential in its velocity range; I wanted the accuracy end of the envelope and sometimes you have to slow it down a little; so once I found that'…., H-4831SC gave me the best accuracy with enough velocity to reach 1k with speed left over... that's were I stopped.
It was also much easier on the rifles barrel giving longer life. I considered IMR4831 {more speed but also higher pressure} but in the past that's always been a little to fast for other application where H4831SC worked.
Two powders I have on my shelf'…, I was going to use but never got around to was, RL-17 and Hodgdon Hybrid
The RL-17 looks like it could be a real sleeper here…. It's an over bore powder with a great pressure curve.
The Hybrid has a burn rate between H-4350 and H4831; man that's just got to be good, as well as having another low pressure curve.
You might think about giving them both a try; if I was shooting the .300 RSAUM now for 1k or wanted the best hunting loads I think this is where I go.
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