Originally Posted by md1911
Sorry for the typo. I mean jump firing were multiple rounds fire at once. I have heard its a problem
If you are talking about a "chain fire", I haven't had that problem. I use a lubricated "wonder wad" under each round lead ball and make sure all my caps are tight and secure on the nipples. If there is a tight-fitting ball over a lubed wad up front and a secure cap on the back, there shouldn't be a way for a spark/flame to get to the powder.
Some people use a bit of crisco (vegetable shortening/grease for cooking) or bees wax or some mixture on top of the lead ball as an additional step to seal out spark from the front (and allegedly to soften the fouling), but i have yet to see the need for that. I think that is more of a historical kind of thing, like using a powder horn.
I do find it helpful to measure my powder and put it into 6 used/empty .357 mag cases and to lay out 6 balls to prevent confusion during loading. My nephew loaded two balls in one chamber somehow (actually twice in same reload).