Curt said:
My choice is 50 or 54.Double ballin still sounds wrong to me,that could be why TC dropped it from there manual.
To clarify...there is absolutely nothing wrong with a double-ball load and they cause absolutely no harm to a barrel.
A double ball load is simply a larger/heavier payload in the barrel, and still not even as large or heavy as caliber size conical offerings.
HERE'S THE CLARIFICATION PART...which is why manufacturers worry from a liability standpoint:
The "potential" exists for someone to load the double ball load improperly.
If one PRB is seated all the way down, then the other PRB is attempted to be seated down on it, in some cases the air column between to two might get compressed and when the ramrod is removed, the top PRB might be pushed back up off the bottom ball some...and by definition it then becomes a bore obstruction, possibly causing damage to the barrel when fired.
Or if someone doesn't realize they have to use a patch on the top ball to hold it snugly in place, it could move off the bottom ball while walking / handling and then also become a bore obstruction.
But done correctly, there's absolutely no problem with double ball loads at all.
They both simply need to be snugly patched business as usual, and then seated down together as a single unit.
IE: short start PRB #1, then short start PRB #2, and seat them both down at the same time.