Author Topic: JM 630/631 kit velocity numbers?  (Read 1873 times)

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dixda

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JM 630/631 kit velocity numbers?
« on: March 23, 2004, 07:33:33 AM »
Has anyone chronied their 630/631 after installing the Maccari spring and spacer kit? I put this kit in my 630 and noticed the difference(for the better),now I need an approx.figure to estimate the fpe using JSB Exacts 8.3gr. Thanks, to anyone that can repy.KD