Even if you melt off the smokeless lube and relube with BP lube, you'll likely run into fouling issues, especially with the rifle. The lube groove on any commercially cast bullets I've seen is miniscule and doesn't carry enough lube to coat even a carbine barrel. You may get away with it in the handguns. If you don't want to get into casting, I would suggest you invest in some BoreSnakes for each calibre. Get some Windex with Vinegar (not Ammonia). I've only seen it at WalMart. I dilute one bottle of Windex with Vinegar into a gallon jug of water. This gets transferred into smaller bottles, and should last you a good long time. This stuff just eats BP fouling. After each stage, douse the BoreSnake with the Windex/water solution and pull it through the barrels. Remember to keep the top of the rifle action facing downwards so nothing runs into your action. This should keep you functioning through the match. I've had some luck with Pyrodex pellets, topped with a WonderWad, and then using one of the re-lubed commercial bullets. Not great, and I wouldn't leave them sitting around for too long after you load them since the lube in the WonderWad may contaminate the powder.
If you want to do a bit of reading on other options, wander over to w w w.cascity.com and scroll down to the Darksiders Den. A wealth of info here. Also, surf over to #### Dastardly's site and read up on BigLube bullets. These let you shoot an entire match without cleaning, but you'll have to get into casting.
Welcome to the Dark Side.