Originally Posted By: Jagermeister
Originally Posted By: pooch
an English shotgun, most likely made between the wars, with no mention of chamber length on the barrels or flats? Thanks


The English proof was based on tons per square inch and not the chamber length in the barrels. One could find gun with 65mm chambers proofed for heavy 1&1/4oz load, etc....


Very true, but Tons psi (Birmingham proof) or "Tons" (London proof) markings are under the Rules of 1954. If the gun is between the wars, then the chamber "should" be marked "2 1/2", 2 3/4" etc" and not in metric mm's.

Shot size should give you a feel for what the chamber length "might" be. If the gun were a 2" it would be marked on the rib also. Best bet would be to just shoot 2 1/2" low pressure loads in her to be safe.

Best of luck!

Greg

Gregory J. Westberg
MSG, USA
Ret