What is the wording on the barrel??? Anything mentioning "nitro"? Or "smokeless"? How about shell length? It may have a shorter chamber even if made for smokeless powder and a 2 3/4 inch shell fired in a 2 9/16ths or 2 5/8ths or whatever old chamber length of the times would be less than a wise decision... If it is a smokeless proof tested weapon with a short chamber, you can get shorter shells or possibly have the chamber cut to modern shell lenghts... But a QUALIFIED GUN SMITH should be sought for their expertise first...