Isn't that the truth. My first MZ was a TC Hawkins around 1985 somewhere abouts. Had no clue about anything other than load some BP, and a sabot, then shoot. At 100 yards, couldn't hit a cardboard box the size of a refrigerator. Moved up to 50 yards and got hits all over it.depending on the era of the muzzle loader, the rifling may not be well suited for sabots.
About that time Knight came out with inlines. Bought one and it was accurate.
Then the internet came along for the masses, and found out the 1:50 rifling in the Hawkins only supported the patch and ball. Went back out with the correct load, and it was quite accurate.