O misread that as "fall off". i don't think they would go off if they hit the ground if it was flat. If there was a small rock that got in there and hit a cap it might. However that's not likely while it's on the gun.
Yet Sam Colt advised to use no such sealing on his revolvers. During lectures, he would load a cylinder, cap it and drop it into a pail of water. Later, he would retrieve the cylinder, install it in the revolver and proceed to fire. No sealant at either end of the cylinder.They used a hard sealing wax to waterproof and "glue" the caps. Not really something we would do at the range but back in the day when you would be riding around in the rain or marching around in the civil war it would have been critical. At least until the fighting started.
So some one should take say a colt and remove the barrel and replace it with a hose clamp with the screw and band out of the way and shoot a cylinder with no barrel over a chrono.
Well, someone?
Must have loaded all 6,
I think you can trust a transfer bar, if you look at one you'll see why.