I posted a thread with a couple different loads (Varget and TAC powder) awhile back.

.204 range report

This is out of an AR with a 24" Shilen 1:9 twist barrel with a 10x scope from a bench/sandbag front rest. You'd might do better with a bolt rifle as far as accuracy since you might not be limited to mag. length of 2.250", or so.

-S