Slow powders are too slow for such short barrels and really need 10"+ barrels to come into their own, or heavy bullets (275 is light). 2400 is probably an ideal powder for this application.
Looks like BlueDot is on par with 2400, but Herco considered faster. Herco might be a good candidate.
On the other hand, for a hunting load where muzzle flash means nothing, if 2400 works why change, right?
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