Originally Posted By: ZWhy won't the choke tube of one manufacturer which is the same constriction as the choke tube of another manufacturer pattern the same? They are both the same size and round.
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If both tubes are extended models they should. I have a notion that porting helps throw better patterns, but I am not completely certain. I am pretty dang sure that an extended model shoots better patterns than a flush with front of barrel model though. The point that most shooters miss is that 12 gauge shotguns do not all have bores of equal inside diameter. It is very important to know the nominal bore diameter of your shotgun before buying a choke tube for it.