Have a 20” SM barrel on a Wingmaster receiver shooting 3” shells.
Hevi 13 3/2/7’s. Hevi 13 Choke .662
280’s in a 10 @ 40yds.
Wanting to run some 3” TSS 9’s through it so interested in your results.
Shot an Indian Creek .665 out of the 20” bbl and the results were about the same with Hevi 13 7’s but the POA/POI was so far off that it made the guns awkward to shoot with Tru Glo iron sights and a Aimpijt as well.