Steel shot ?

[2busy]

All rem choke barrels are steel shot safe. Steel in a mod choke patterns like a full. Tighter than modified choke must be labeled steel safe, Carlsons and Trulock sell chokes that would work. Rem arms can barely get a gun out the door.
I would consider Remington fixed choke barrels not compatible with steel. However they can be used with no toxic shot like Boss shells (copper coated bismuth) which perform more comparable to lead in pellet energy and pattern.

I ordered some Carlson choke tubes to expand the versatility.