I have a Browning auto 5 shotgun from the 1930's It is 16 GA 2 9/16. I think it was changed along the way to 2 3/4. If it was still 2 9/16 would the 2 3/4 shell fit? A 2 3/4 shell loads and chambers but I have not shot it. Thanks. Warren
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I had forgotten about the extra length for the end of the shell opening up.
I think the ejection port also has to be lengthened. I wouldn't do that to my gun and it's not in as nice a condition as yours.
Um, here's another consideration for the old shotguns................
The really old guns were made with DAMASCUS steel barrels. And, the propellant was black powder, which creates much less pressure than smokeless powder.
DO NOT SHOOT modern smokeless powder shells out of an old damascus barrel. They are not strong enough to take the pressure.
Unless you want to get into the reloading of shotshells with black powder, the old shotguns should be just wall hangers.
So, check the barrel for what it's made from before you fire any modern shell in it.
I have a 1957 A5 and the barrel is actually stamped "2 3/4" in fine print, check to see what the barrel says.
wcmachine - Head over to shotgunworld.com and find the browning section - use the search and check the stickies - there's some really excellent write ups on how to correctly modify the short chamber guns to fit 2 3/4" shells - There's a lot of good info on dating your gun and IDing sweet vs standard versions. Also understand that some will tell you it destroys the collector value to stretch the chamber, etc. - others will tell you it's a shame to not fire it at all...
Search RST shells in the 2 1/2 flavor - these will run in the gun with no mods required.![]()