Check out the ballistics on the Winchester Partition Gold 20 gauge Sabot.
My kid has taken several deer with it in a 20 gauge w/ a rifled barrel.
If I remember correctly is is a 245grain hollow point copper jacketed slug doing about 2100 fps. That is hotter than most any magnum muzzle loader around.
2 inches high at 50 and dead on at 100 yards. Great for any short range deer gun.
Hank