How far your piston should travel

[SpudBlaster15]

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[jrrdw]

So all most half an inch. There goes the d4 rule. My barrel bore being 1". Thanks for writing it all out, but I must tell you my math isn't that good. I mite as well be trying to translate the Chines language. I can't speak Chines. I was looking for a answer like this, common sense tells me 1/4" of the barrel diameter just isn't enough!