Sounds like older guns you might not want to use heavier-than-lead in. TSS will score a barrel if it gets loose from the wad.
Originally Posted by prairie dog shooter
I shoot Federal premium loads with 1 1/8 ounce of copper plated #7&1/2 shot in an 870 full choke.
Got a link for that load?
I bought a lifetime supply years ago. There is a photo of a box of them in the article I linked to here. Haven't looked but I'd bet they are still available.