Don't ruin an ML by using anything but smokeless powder.
When the comment was made about ruining an ML, I do not think it was intended as a broad description of sporting arms that load through the muzzle but probably refers to the model designation: Savage ML-II.
I think that's the issue here that has some folk seeing red, mistaking the reference of "an ML" as meaning muzzle-loader.
I'm not gonna get involved in the argument of who's right or wrong. Too bad narrow mindedness puts otherwise like minded people at odds, but it's been going on for decades and isn't likely to stop anytime soon. Archery vs firearms, vertical vs crossbow, cartridge vs muzzleloader and you can break each category down ad nauseam. Sad that
