Hello
I own a Darne R13 in 12 ga. and the mouth of the left chamber is .803 in. I am cutting down win.AA shells to fit the 2.5 in. chambers but the maximum allowed cartridge size at the mouth of the chamber is .810 and the actual unfired AA shells measure .806 in. or more. Obviously I can't chamber them. I have managed to swaddge down the AA shells to .803 in. but this makes for very hard extraction.
1. Why are Darne chambers so tight?
2. Is any ammo available to fit these chambers?
3. Should I ream the chambers?
Regards
DblFixer