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I am currently using 165gr flatpoint with 5.6 grains this seems to work good with the 13lb spring. I however tried the same with both 4.8 gr and 5.2 grains and I have to rack the slide manually on the 4.8 and will not eject fully on the 5.2. I am now trying 180gr hp with 5.6gr will this work better or worse with 13lb spring. Should I but the 11lb spring for the 4.8 or less charges. One more question I do not have a cronograph so what would be an approximate Powerfactor and velocity. just some type of estimate.. Any help will be greatly appreciated thanks Brian