Russ is correct. Be careful on going to too tight of a choke with TSS, and use chokes designed for TSS when feasible. Those TSS specific chokes have gone through an extra hardening process. Because TSS18 is actually harder than some shotgun chokes.
I load my own TSS18 for all bird hunting, and mylar wrap the shot inside the shot cup to help keep any pellets from escaping through the slits in the shot cup and contacting my barrel/choke. For larger sizes like my anti-bear 1B Buckshot TSS18 loads I double mylar wrap the shot. To protect barrel and choke. As I don't know how the shot is wrapped in factory ammo, I'd suggest being conservative on how constrictive of choke to use with factory TSS.
TSS18 naturally holds a tighter pattern as it doesn't deform like lead and bounce around on each other as much going down the barrel. I shoot Cylinder choke for decoying ducks, grouse, quail. Modified for geese and pheasant, and Full for turkey (occasionally geese if I'm expecting longer shots).
