Thank you my friend. They are Krupp barrels. I figured it would be fine but thought I would get the group’s opinion. I shot unknowingly a 1903ish 12 gauge with magnum modern 2 3/4 shells for years and never had a problem. Then I learned that older guns from Europe especially, were chambered in 2 1/2 inch. German steel and guns are famous for quality. But after learning my potential ignorance could have been disastrous, I’m doing my homework, so they say.
Thank you ever so much.
Kurt Otterstein

Kurt Otterstein