I believe all this thick patch tight fit stuff, really I do, but my %$@##!! modern shallow groove alloy steel barrel maybe needs someone smarter than I to load it. Tried nice .440 balls in this .45 cal, great at 25 yards but then so is a slingshot. Not so great at 50 yards. Went to 0.018" store-bought patches w Mink Oil. On the third shot I had to go home to get a brass rod to pound that nice ball down the barrel, it being stuck about half-way down. Cleaned it, same problem next couple of shots. Took it home, cleaned it, leaned up in the closet. Bought a low-wall .22rf. It goes bang.
In my mis-spent youth I used bore size .420" balls in my re-cut antique Deringer, spit patches, never knew about problems loading. Must I admit? - I sold it.
I suppose this damnable modern barrel needs the muzzle crowned by emery paper ( = unobtainium) & a strong thumb. One of these days . . .