I have an old Model 12. 30" full choke. Okay, fine, but that was with paper hulls. With modern plastic, it's XXFull..............
Are you really meaning the plastic shot cups(wadds) replacing the card wads and such???? And is your "OLD" Model 12 a 2-5/8" chamber??
For the message of the Cross is foolishness to those who are perishing, But to us who are being saved, It Is The Power Of God. 1Corinthians 1-18