Both calibers are excellent with the 45/70 being my favorite. You can't have too much gun for big hogs.A large boar'sshield can stop high velocity bullets from penetrating. Unbelievably so! A head shot is perfect if the opportunity presents itself. Other than that, shoot low and forward, as close in behind the front leg as possible. Their major plumbing is well protected by that shield and legs. Good Luck!