I am using a T/C Hawken with a GM barrel this season. I put a dry patch on a wire brush & run it through the barrel to get any oil out (I use a wire brush becaue it gets into the coned face of the breech plug). I then take a second patch and run it to the breech. I snap a cap and make sure the fire is getting to the patch. I pull the ramrod, snap a second cap and then run the patch through the barrel again making sure air is being forced out the nipple (to be sure it is clear).
I load then and go hunting.