I got similar results to Erich with Power Pistol and the Remington 125 grain SJHP. Federal +P+ cases, Winchester Small Pistol Primer.

6.3 grains PP & Rem 125 gr SJHP

M-60-10 3" 1043 fps
M-64 3" 964 fps
M-642-1 2" 863 fps
Det Spl 2" 869 fps

6.4 grains PP & Cast Lee 150 gr SWCHP-GC

M-60-10 3" 1017 fps

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KSCowboy