Actually the powders that give the highest velocities in longer bbl's will also be the powders that give the highest velocities in short bbl's.
As far as 38spl p+ velocities go, that is sort of vague statement at best. Typical 38spl p+ velocities with 158gr bullets:
Snub nosed revolvers (around 2" bbl's) +/- 800fps
4" bbl's +/- 950fps
6" bbl +/- 1100fps
Then you have to figure in:
loose +/-10fps for using 38spl's in 357 cylinders
loose +/-10fps for every 1/1000th's of cylinder gap
At the end of the day you'll find that a 3" bbl'd 357 will be hard pressed to keep up with a 6" bbl'd 38spl (p+ loads) without using 357mag loads.
Some might think power pistol is too "flashy" but it can and easily will throw any of these powders a beating when loading 38spl p+ loads:
unique
ww231/hp-38
aa#5
titegroup
be-86
reddot/greendot
Short bbl'd revolvers are a real eye opener when it comes to velocity. Try some real world testing. Buffalo bore's website with it's real world data/their ammo tested in common firearms is a eye opener. Plus you have something to compare your loads/reloads/results with. They are 1 of the best ammo mfg's out there.
just another opinion
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