I have tested the 28-gauge factory XXF choking on the 28"-barrel sets, I have several sets of them. Yes, they or over choke but they work properly. I have my notes on testing a set that had .033 in the full left barrel. Normal full choke in 28 gauge is listed to be .020 Tested on my steel patterning board at several known distances. Patterns were nice and even and would make a mess of a grouse at less than 20 to 25 yards with a direct hit! If you wanted to hunt turkey's out to 40 yards or so it would do a great job, patterns are even, and the gun shoots perfect point of aim. I also tested with several factory loads of 7 1/2 and 5-s. Conclusion, while .033 is much more choke than I would use for upland bird hunting the choke does what it is intended to do and does not throw defective patterns that I shot. I don't hunt wild roosters with my 28-s but if I did the full would work as intended stating at 25 yards out to about 40. SXS Ohio
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