I've noted the choke restriction/constriction? on a 12 ga is .005 each step..005-IC,.010 IC,etc.Does this hold true w/all gauges?One source said .004 for 16ga.I know this seems a bit esoteric,but I'm soon retiring and comtemplating amateur gunsmithing.Want to be sure of my facts.Another reason-I have a 12ga Jamart(mfgd Belgium) marked 18.3/18.4 on both bbls.Thought this meant 1-18.3 and 1-18.4.Not so.Found identical gun each bbl marked 18.2(dbl mod).Am looking for other gauge guns euro-made and need to figure choke.
