I bought a TC Hawken from Dixie in 1982.
Their catalog recommended testing a new rifle with a double load.
So I put in 90 grains powder and two, patched round balls.
Then, like the catalog said, I stuck the rifle in a tire and pulled the trigger with a kite string.
It didn't blow up so I figured I was good to go.
I was intrigued with this load and I tried it four or five times at the range.
At fifty yards, the two balls were dead on, side by side and 2 inches apart.
I figured that would knock hell out of a deer on a lung shot.
But, I figured at 100 yards it might become inaccurate. Plus, obviously you got less foot pounds per ball.
I never tried this load in the woods, never fired it again.