A single pellet of 00 Buck (There's a reason for the name) weighs 54 grains.
Or use slugshot - 427 grains, 960 ft/sec @ 100 yds
Thanks for the tip. I have only used shotguns for dove and quail hunting. I prefer to use an 8mm Mauser, .303 Enfield, or M1 Garand for deer.