Originally Posted By: Franchi

One method was to score a shotgun shell almost the entire way through the hull in front of the case head with a knife. Upon firing, the hull would tear apart and the score line an become a solid projectile with the wads,shot and hull acting as a solid projectile! Thus it was legal to us as a deer gun firing a single projectile!



It's called a "cut shell." See here: http://www.youtube.com/watch?v=k3M46XVfVOU