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Join Date: Jul 2010
Location: PA Dutch Country
I've had a few polys, new and old, and they turn all the way down to xtra. That is your tightest choke, then back all the way out to slug or cyl, plus one past for open. Any more open than that will not matter except to risk damage. With a dial caliper you can measure and will probably come up with about .700" at xtra for a 12 ga., and .730/.735 at one past slug/cyl. .700" is only about a 0.025-.030 crimp type constriction There is no parallel section, it just tightens up the collet fingers, so they don't shoot real tight even cranked all the way down. Not like a nice old fixed full choke that is 0.690 or tighter.
I've never noticed a point of impact change, but the screw-in polys can be a pain with wanting to back out the choke threads (ie, remchoke/winchoke/truchoke) when you are only trying to open the pattern a bit. Also, the screw in polys will not necessarily index with the indicator on top in a certain gun. And of course, it is possible to shoot the choke off some "fixed" polys...seen my dad do that with one. Silver solder job on a model 12.
Last edited by FullandFuller; 08-17-2018 at 12:28 AM.