Anyone who shoots a sabot bullet has had the problem with loading the next round with a dirty barrel we have all struggled with it.
Between muzzleloader shots I have done some research and testing on my own to find out what works for me for the next shot. I have been using a product called bore butter and when the muzzleloader is just sitting around I leave it caked in the barrel for protection. Have also found that if I lube my sabots with bore butter they really slide nicely down the barrel.
Between shots I used to run a spit patch down before loading the next round, but have always wondered what happens to the spit that doesn’t evaporate right away before you start stuffing your muzzle with the next load. If you're not pulling the trigger right away I believe that some of this moisture could possibly affect your next shot.
A simple discovery at home one day while cleaning windows with Windex, the windows where warm from the sun and as I would wipe it away it would evaporate almost instantaneously and it popped into my head "The barrel of my muzzleloader would love this." So left the rags there and took a ziplock bag and some patches soaked them with windex and off to the range!
I was impressed with the cleaning power between shots and it will evaporate almost immediately as you pull the swab out, it defiantly works wonders and to this day you’ll never see my muzzleloader pack with out a ziplock bag and windex soaked patches in it.