OR,
His Field was never chambered for 2 1/2" shells. Those post 1913 guns were all 2 3/4" chambers. His gun will shoot 2 1/2" shells just fine, I shoot the RST flavor in mine, but it would have been chambered for 2 3/4". If you have a pre-1913 for black powder, it must be a really early gun. My...