The reports of MOS leaving a hard to cleaning residue in the bore has me looking at other options. Talking with some of the local long time muzzleloaders about patch lubes, many are using equal parts MOS and Neatsfoot oil or Peanut oil. A couple are using just Peanut oil.
While washing a pizza pan after dinner last night, I was pondering the use of animal or vegetable oils for patch lube, I noticed the brown "varnish" that had formed on the pan and remembered the same residue on a carbon steel wok I used to have. One of my other hobbies uses fuel made from an alcohol / oil mix, which sometimes contains Castor oil. I have noticed a "varnish" like buildup on the internal parts and on the outside of the engines when Castor oil is used in the fuel. Do you suppose this is what is happening with the Murphy's Oil Soap as it appears to be either a vegtable or animal based oil?
Thanks again
R.E. Klaus