Have a M97, 20" Cyl. 'Police Model', c.1930's. Got it for a song from an estate group that came in a LGS when I was working there.
It's been in storage for a long-pending move. For the guys here that know, is it OK with 2 3/4" ammo? Not sure when they switched from 2 9/16".

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Ret'd LEO
SWCA #2275