Some people will tell you it's ok to shoot shells longer than the chamber length- I wouldn't personally.Too many variables on pressure, plus you are shooting a keepsake , vintage heirloom.2 3/8 " cham.sounds strange - how did you measure the chambers? Try a chamber gauge. The only shells shorter than 2 1/2 in. I have seen from the first half of the 20 th century were 2 inch.But I still am lacking on 3 inch cham. gun info.Some guns may have been 2 7/8 in. chambers- go figure. I would say that a 3/8 inch difference on chamber /shell length is excessive for safety.Remember that todays standard loads are optimal as far as high tech is concerned-cases, powder, wads, etc.
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