Welcome to communism, first the non-lead bullets and then healthcare. The copper bullets kill just fine, You have to go with less bullet weight to help with the over penetration. Over all I don't care for the lack of pin point accuracy.
Sean good job on the doe, I will look for the buck thread.
What does "gauge" mean anyway? As used here gauge means the number of round lead balls the same diameter as the inside of the barrel (aka the bore) that it would take to weigh one pound. It takes 12 lead balls the same diameter as a 12 gauge barrel to weigh a pound. The smaller 20 gauge would require 20 balls of that barrel diameter. The larger bore 12 gauge would require 12 lead balls of the bore diameter to weigh one pound.
In general the number of pellets in a shotgun shell...