200 to 300 fps between them out of 7.5" X-frame for same bullet, if you load 325 grain or heavier the the gap gets even larger.
355 grain HC out 454 1550 fps - 460 1980fps both at 57kpsi out of 8" test barrel
Some time back I posted 460 loads velocities for same bullets out of the various barrel lengths.
be safe
Ruggy
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