I have one gun that benefits from snapping a couple caps before loading up for a hunt. Two others don't seem to need it at all. One of those can be converted to flint in just a few minutes and needs a good fouling shot before ignition gets consistent. But in percussion, no problem. Yet one more is a pain in the rear & seems to need a dozen or more caps to go off before it will ever ignite the main charge -- even if I snap a couple caps before loading. That one is a double barrel shotgun so it has to be done for both barrels. And once I get one shot to go off, then the rest are very reliable. But that first shot... Somebody out in the duck marsh heard me snapping caps before daylight and yelled, "Stop shooting!" Darned right barrel just wouldn't go off.