I am a little surprised that some are suggesting to the OP to shoot out a load that is blocked by a single preluded
patch under the powder.
Wonder what will happen if that 70 grain ‘main’ charge of 3F ignites sometime after the suggested kicker charge starts the main charge down the bore but before it exits the bore as pointed out by
@Art Caputo in the second post of this thread? First damaged barrel I ever saw was caused by a normal load of powder under a patched roundball that was only seated with a short starter. Barrel was ‘saved’ with a rebore.
I have an idea. Take your most precious muzzleloader, drop 10 grains or so of powder down the bore, followed by a patch. Then load your normal hunting load and light it up. Try maybe a dozen times and report back. Just doesn’t seem safe to me, but I’d love to learn what happens. Maybe I’m just a Nervous Nellie?