I hunt with an older 20ga single shot that is barely xfull fixed choke, it will pattern 1.5 to 1 5/8 oz tss farther than I would shoot one
not being as tightly choked as a turkey choke, it patterns #8 tss better than #9's
if your gun is a fixed full, shoot a couple and see what it does,
if it's screw in, depending what type of pattern your after the Primos already mentioned, Carlson or Truloc are a small investment compared to the price of TSS