When I started loading Tss 10 years ago everyone told me to use a factory full choke out of my Benelli’s. I found through patterning that the tight Indian creek chokes work good in the sbe 12 gauge and m2 20 gauge. I am using a 573 in my 20 gauges and 660 in my 12’s.
The only guns I have gotten to pattern Tss well at 40 yards with factory chokes are some older shotguns with tighter (light full and full) fixed chokes.
