It's not the same round. Hevi 13 is produced in high volume now by a ammunition manufacturer. Nitro is not. The reason Nitro ammo is so expensive is it's custom loads built to certain standards. You can go to the Nitro web site for more info. I shoot the Nitro shells in my Remington 870 with a Rhino .660 extended choke and get an unbeleivable pattern. You can go to the Nitro web site for more info on what shells shoot best in your gun and with what choke tube. I hope this helps.
Good answer if that was his question. I am not sure what you answered but you did advertise well.
