Well after being impressed with the way the MX Cowboy solvent did with my centerfires, I used it on my 45 Renegade. Most of you remember that this is a relatively new barrel and has less than 100 shots through it, mostly all with saboted bullets. It had always gotten a hot water bath/rinse followed by bore butter as did all my other MLs.
I just got done running a pot full of hot water through it to heat up the barrel and get rid of the bore butter. Took it back in and ran a couple dry patches through it. Then some patches of Butche's Bore Shine, dried, then a couple alcohol patches and dried again.
I put some Cowboy solvent on a patch and figured it was going to be black. To my surprise it was as clean as it was when it went in. So I ran a couple dry patches through it and treated it with the bore conditioner.
I'm putting another pot of water on the stove and do the same to my 50 cal. I know that has several hundred rounds through it. I'll relay the results later today.