 , for your Gp100 I'd recommend 13.5 grains of 2400 with a 158 grain hardcast SWC and a Standard small-pistol primer. I get 1349fps average velocity out of these in my six-inch Model 28. Generates 638FPE.
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Diligentia, Vis, Celeritas
COTEP#CBOB0428
NRA,GCA,OGCA, USAF,Msgt.(Ret.)
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