TSS stands for Tungsten Super Shot. Turkey hunters are forever trying to get an advantage and there's a huge discussion about TSS loads in the Turkey hunting community.
Today the team from Just Hunt Club discuss the TSS Option.
People are using Mossberg 28 gauge and 20 gauge Mossberg shotguns now for turkey hunting. Some even prefer the .410 in a sub gauge for turkey hunting.
Here's a Mossberg SA 20 Tactical Turkey gun many hunters are using with TSS loads:
https://www.mossberg.com/sa-20-tactical-turkey-75799.html