The guys who shoot unlimited bench rest muzzleloaders in the TMLRA shoots all wipe between shots. First a damp cleaning patch followed by two dry patches. They also load very tight, a coned false muzzle allows bore or larger sized balls to be loaded without cutting the patch. But they are allowed two consecutive 30 minute relays to get off their five shots. A lot of that time is spent watching the wind flags waiting for conditions to be perfect for a shot.
Offhand rifle matches have to be done in one relay, five shots. Considering my ability to hold the rifle still while squeezing off a shot, cleaning between relays is "good enough", I use a damp cleaning patch on my ramrod to wipe as I seat the ball. If I put a shot in the 7-ring, it was my, not the rifle's fault. On the 100 yard target, a lot of the game is waiting for a hole in the wind to shoot through, especially with my .36 caliber offhand rifle.
When shooting trap at the shotgun range, I just load the barrel and after the barrel is loaded, I squirt a shot of water+Murphy's Oil Soap down the bore. I can pretty much shoot indefinitely that way. If the bore starts feeling dirty as I seat the wads, I'll increase the amount of water/Murphy's mixture down the bore. A lot of it depends on the humidity.
When I'm shooting black powder cartridge shotgun trap or skeet, I'll carry that spray bottle of water/Murphy's with me and spray a few shots down the bores while waiting to shoot at the next station.