I didn’t, not properly anyway, until I started futzing with sub-bore turkey guns and TSS. A major hurdle was that neither of the ranges I frequent allows shotshells on the rifle ranges, nor targets placed anywhere but on the berms. Our clays range has a patterning range, but it’s only open with an RSO on site. Solved that by becoming an RSO myself.
Patterning revealed that the CZ O/U 20 turkey gun I so eagerly acquired was shooting 8” apart at 40 yards. Since they wouldn’t/couldn’t do anything to fix it, and the only fix was expensive and troublesome custom tubes, it went away.
