I won't have to sport a black eye for a week when I tell my wife I spent $110 more for the 10ga.And honestly I don't know. I don't know enough about the differences between the two to make an educated decision. This may sound silly but a local gun shop carries 12ga RBs. He doesn't stock 10ga balls and I know I will use roundballs to hunt hogs. Is the 10ga performance that much better?