"should" favor the heavier bullets then?
I would recommend spending some time on 300blktalk.com and look at some of the subsonic pet loads to use for reference. I know you listed some of the brands of bullets you've tried, but you didn't mention bullet type... You mentioned 208s, I would guess these are A-max? Have you tried 220 SMKs or any cast bullets? For bolt guns a lot of guys prefer coated cast FN bullets in the 230-250 grain flavors. There is a 240 grain FP bullet/mold designed for 300 blackout. A1680 is the powder of choice for 300blk subs, but is quite elusive.
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