Thanks,Rocketman.So-15ga CONSTRICTION (cleared that up)really would be 0.004.20ga prob..003,etc.Makes sense ,more so the smaller the gauge.i.e..005 contstriction in a 67ga at each step would produce a full choke about the diameter of a pencil!Talk about tight!I imagine .410 would be .001 or thereabouts.Now I've got to get out my handy-dandy calculator and convert to metric.I'll probably break more at skeet now that I know my old 12ga is skeet/skeet.Also know why the 16 NID w/mod blew more feathers off the birds last Nov.
