speer make awesome soft projectiles that would be...arguably more suited to the task you asking it to do...
2206h data is out there and being such a chunky powder SHOULD give you a fuller case=better burn.
there used to be an rule/suggestion to look at the powders that would give you desired velocity and pick the one that gave you most volume filled in the case....for most even/consistant ignition.
and YES a lighter load is noticably quieter than a hot one...
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