Being a pre-war gun, it will have the 2 9/16" chamber unless it's been altered. Many of the short chambered guns function fine with Remington ammunition as the hulls are actually a bit shorter than standard. At least that was the case before Remington was acquired by Federal.
All I have remaining is a 1938 model that had been altered to accept the longer shells. The alteration makes the gun look like the barrel is not inserted into the receiver and tightened correctly. For that reason I was able to pick mine up for a song at Cabela's. They thought something was wrong with it and sold it as a wall hanger!
