Look at the patterns of my Mossy Super Bantam (22" bbl.) shooting TSS. I used two different chokes, PG .555 and .570. I originally bought the .555 to shoot Nitro 7s. There are a lot of high quality chokes to pick from. If you plan on using the Federal load with flite control wads, a non-ported choke is recommended although I have read reports that it didn't make that much difference between ported and non-ported. YMMV.