I am at a loss as to how this particular combination has worked out so well, and I am still amazed at what the 338LAI can do. Being a devout 50 and 20mm addict always figured a guy would be real hard pressed to be able to get bullets as far as we are with the 338LAI. The barrel life has truly surprised me as well. You are not the only 1 who has questioned this.
As for Gun Juice, the folks at Microlon who make it will not divulge what the secret formulas is, but from the heavy alcohol smell I would suspect that they have come up with some form of super lubricant that they suspend in an alcohol carrier. They claim it is NOT teflon , PTFE or moly.
You start off with a perfectly clean, or in my case unfired barrel, and after shaking the hell out of the Juice can, soak a cleaning patch and run it through the bore, let it dry for a few minutes and repeat the process. They claim 10 applications in this manner will give a complete coating of the bore. Being a tad skeptical, I then shoot 1 round, wet patch , shoot a round and wet patch several more times. This DOES give complete coverage. they claim it is a 1 time use permanent dry lubricant, again being a skeptic, after a days shooting I run a couple of wet patches through my bore to get out the carbon fouling.
Gun Juice will NOT remove copper, but does well on carbon fouling.
The secret is to coat the bore before you shoot the rifle, that way a barrier is established between the steel of the barrel and the copper jacket.
There are some interesting side effects as well. That being an increase in bullet velocity, my own experimentation has seen between 35 and 147 fps increase depending on caliber. I coated a piece of CM barrel that I polished with 320 grit paper, applied juice as directed and tossed into my hot blue tanks, while not hot and in use for a few weeks, the part that was coated had a light patina of grey the rest of the steel was badly corroded by the salts.
I do not use any other cleaning products now in my own guns.
getting the copper and carbon 100% out of a fired barrel is important as once you coat the bore with Juice, anything missed is permanently in the bore.
Glass bead blasting or temperatures over 700 F are the only ways to make the Juice go away.
The fellow who developed this was a gun person,(Bill Williams) who made some sort of 17 cal wildcat that apparently was truly hell on wheels, but was also a phenominal barrel burner, his development made it possible to get thousands of rounds of use from his 17 cal burner.
I came across this product several years ago in an article in American Gunsmith magazine dated 2000, sorry I can't find the issue #
I think if you try it you will find similar findings as I have. Then folks can question you when you claim longer barrel life than is normal
Long Distance is BETTER than being there