I inherited a Parker 12ga from my Dad. I believe it is a GHE grade. On the bottom of the barrels, up near the receiver, it is stamped 3" Chambers. According to the serial number on the gun, it was made in 1898 and has modern (not Damascus) steel barrels. I can remember my Dad shooting 3" shells in the gun in the 1960's before he died. My question is--does anyone know when the 3" 12ga shell was introduced? Also, if I wanted to shoot the gun, would it be a good idea to shoot Kent Tungsten Matrix or some other shell in the gun?