Hevi Shot sold their actual hevi shot #2 3" 20ga ammo for awhile, I bought a bunch for next to nothing in a hardware store in rural SD they were too expensive for pheasant hunters that could still shoot lead and no demand from local duck hunters. I keep a few around for my little CZ Bobwhite in case I find a spot that really needs calling.
I wouldn't shoot TSS in an older fixed choke 20ga that was built before steel became mandatory for waterfowl.
There are a number of California predator callers using TSS.
