."Not a liquid, Mink Oil Tallow is actually a soft grease, the tallow rendered from mink fat." I have been using this from Track of the Wolf for several years. I bought a Uberti Santa Fe Hawken from a friend at work, 52+ caliber (520 ball, 526 too tight), based on a Jim Bridger rifle in the Santa Fe museum. It was made in 1985. He got it from Track as a kit and a gunsmith in Huntsville finished it for him. Beautiful, 33 inch browned, maple and German silver. I went to the Track site because this was where the gun came from and found this patch lube. Lube patch strips before hand and cut at the barrel, run a prelubed patch every ten shots just to be safe and consistent. I use hot water to flush, dry and relube. Brush with a .50 brush with a patch on it. I believe not "scrubbing" the bore is part of the secret. Works great, never a hint of rust. Always cleaner than any of my centerfires. P.S. Just got a .50 Pennsylvania , got it ready to go this weekend