As noted, slow pwoders give the highest vel regardless of bbl length. BUT, some will work a bit better than others in 3"-4" guns. FOr heavyier bullets, 2400 burns a bit better than H110. Even running Unique or WSF at the top end gets you pretty close to 2400 or H110 w/ less blast, maybe 50fps short. My 3" lives on Unqiue & 2400 w/ 240-270gr lead bullets @ 950-1100fps.
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