Why TC put 1:45 barrels on their BP's I have no idea. It won't shoot ball, nor the mininies with any degree of accuracy.
My Hawkin .50 on a good day will get under 6" groups. I don't think I ever got a 4 inch group at 100 with it.
I have taken it moose hunting several times, without luck, but with no worries about "accuracy". A washtub size fatal area vs a 6" group at 100 yards or less? No problem!
Of the 20-some moose I have taken, only two exceeded 100 yards, one by 40, another by 60 yards. My average distance is about 65-70.
Get close enough, even a smoothbore will kill ( one moose with 12 Ga. slug at 35 yards).
Actually, except for drop, that Win 1200 with 1 oz slugs gets better groups than the Hawkin!
