Danny Caywood has his own way of doing things, like not liking touchhole liners and double balling a .48. I'm not saying that he is neccessarily wrong, just that he does some things a little different than some others. I guess that just goes to show there is more than one way to reach a destination.
If you do decide to load with a double ball, whatever you do, be SURE the second ball is firmly seated against the first. If there is any gap at all between them, then the second ball becomes a barrel obstruction instead of a projectile and can have deadly consequences for the shooter or bystander.
I personally, would rather go up in caliber if I needed a larger gun.