Shooting lead through a full choke is ok.
I would be hesitant shooting steel through that 1951 fixed full choke barrel.
Steel wasn’t a thing back in 1951. I’ve seen barrels split because of this. not saying it’s a 100% guarantee something will happen, just saying I’ve seen it happen. Never with lead, steel was the problem.
Newer screw in full chokes, some can handle steel, others will say “No steel right on the choke tube right on the choke.
Your gun, your choice.