Welcome to the forum. I reload but not black powder .My understanding though is black powder needs the ball pushed down hard on the charge so it will not detonate .Not sure how that works in cartridges though .great question though.The guys that do cowboy action shooting can probably shed more light but my understanding which is minimal at best goes like this.You can load BP in any cartridge firearm as long as the case is full and the charge is slightly compressed .That said even in a grid down scenerio I would rather have a good supply of smokeless as BP is very very hard on firearms and clean up time is long .