Fully Rifled- Shotgun Barrel -Ammo.

Trying for accuracy and yet wanting a bullet that is good in knocking a Deer down.I would like to hear comments as to what type of Sabot Slugs you use for hunting.I bought a N.E.F.-single shot-12 Ga.-rifled barrel-mounted a scope. Haven't shot it yet; but want to save on money and pain to my shoulder. s.gun