Making the jump from HH to AH

I'm sure others will chime in who have more expertise.

For a given weight, look at load data for similar weight bullet. Pick a powder that gives quite a bit less case fill and start a ladder. If you run out of case capacity and want more velocity, go to a faster burning powder.

If you want top end velocity, choose a powder with higher energy content. Examples would be RL17 (over RL16), Varget, RL26, etc.
 
Gonna try TAC and IMR-8208. Talked to a guy about the absolute hammers and he says the design are the same as bore rider shells in the old naval rifles. He had some interesting insight.
 
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