The rib might tell you something about the influence that made Purdey's built a 25" gun. MOST 25" guns that were built were built according to Churchill's ideas, which included a raised, narrow, file cut rib.

PS: just about all Purdeys built in the last century were self openers built on the Beesley action design.

Can you post a picture?

Last edited by Chukarman; 05/06/18 12:57 AM.

C Man
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