Well now Pilgrim....let's stretch it out to 500 to 1,000 yards!
Subs are made with some type of organic acid (such as ascorbic acid). Much more corrosive than real black if not cleaned promptly.
I can clean any rifle with 3 or 4 patches and one pull of a bore snake. Real simple.
Granted, you realistically need to cast bullets if you shoot much volume, but i enjoy it so I don't consider it a hardship. Gives me an excuse to get out of the house and into the man cave
And let's not forget the fun of the smoke and boom and choking posse members. And you can fog the south Texas mosquitoes off the stage for your pards!