On the Tamers, maybe the thinking is to get a better pattern for 25yd and over shots, since the barrel is only 20". But, that argument cannot be used on the 16 s. I have thought of having my Tamer 20(when I get it) opened to Mod. choke. Won't cost much and would make it a much better shooter. IMO I will have it mic'd before that decision is made. I had one of my 12ga barrels mic'd a while back. I don't remember what the measurement was, but the smithy said it was wider than a Mod. choke should be. H&R has really been know for having tight tolerances, so who knows, it may not really be a FULL choke.
Brett, the muzzle on my Tamer 410 is not the same OD as my 20ga barrel. Maybe in the chamber area they are the same, but the 410 barrel has a taper to it.
cookiemann