When the learning stops, " A man convinced against his will, if of the same opinion still."
I see no benefit to multiple ball loads, except for one match we had back in 1976 of so.
25 yards, high score in 2 minutes. I had a Sharon 'deep groove buttoned barrel" I bought from Hall
in Kalispel Montana in '75.
I didn't use patches, but did use .375" pure lead balls, a handful each shot, pushed down several at a time
using a steel rod- quickly.
I won the contest & the 10 or 20 lb. chunk of buffalo meat when was first place prizes.
I had 27 balls on the target for score & the lowest score was 6pts per ball. Multiple balls do have a place.
I would never consider using a multiple ball load for big game hunting, especially here, where your shot might
be only 15 yards, or 150 yards. Accuracy and reliability are what is needed. I would/could not trust the double ball load
to hit where I needed it to.
Afterall, a double ball load in my hunting rifle would be 964gr. weight - what powder charge would you double ballers suggest?