More specifically in an older 42. Any issues?

No issue's at all.1949 cylinder bore.

I collect and shoot 42s. They will safely digest any modern CIP or SAAMI 2.5" or 3" factory shell (assuming 3" chamber).

No steel shot?

Your great great grandchildren will be shooting it.

Not in my 42s......well, maybe the repro.

Okay, thanks guys.

There’s going to be a 42 in my near future.