When I loaded a Hodgdon 158 XTP for my S&W 686, 6" revolver
14.5 grs of IMR 2400 powder gave me a "Fac Dup" load that did 1274fps.
You can hang on for dear life if loaded up to 1340fps but a factory load
is a lot nicer to shoot.
If you have any HS-6 or BE-86 powder you can down load to 1108fps for
a light target load, with this JHP bullet.
Have fun.
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