I agree with everything sedancowboy wrote in his post. I have heard of shooters having terrible rust problems in their barrels from moly degrading to some type of salt and rusting barrels in a short time, up to, and including just overnight. The danger comes from the humidity of the area one lives in(hint hint). I started using moly when I lived in Northern California(Paradise in Butte county) and I still use moly now that I live in Montana and like sedancowboy, I haven't had any of the problems that all of the preious moly users always quote in moly threads like this one. I honestly believe that when the moly craze started years ago, people bought any moly they could get their hands on, probably trying to save money, I also believe very few of those people knew how to properly apply their moly to their slugs and barrel. Believe it or not, there were companies selling moly in aerosol cans to be sprayed on loaded ammunition. If one doesn't know how to apply the moly, they were probably applying too much moly to their slugs and barrels, also, using the wrong grade or using moly that is made for other applications will cause various and sundry problems. Moly isn't gooder the more one applies. Too much moly will cause glazing inside the barrel and I have heard it's almost impossible to remove. I have fired thousands and thousands of handloaded rounds and all of my oldest firearms still look pretty good. My newer firearms look just as good as the day I first moly'ed the barrel. All of my family's firearms don't lose any accuracy but we can "get away" cleaning the barrels down to steel once a year only. I have had no rust, glazing or loss of accuracy due to any of the moly problems that everyone always bring up in moly threads. Load your slugs. Clean your rifle after you shoot the moly every time or simply oil your barrel so any humidity can't get to the moly and affect the bore of your firearm. I moly my 257 Roberts, 6.5 Grendel, 6.5 CM, 7.62X51, 7mm mag, 270Win 257 Wby mag, 300mag and others I am probably forgetting right now. I do not moly any of the family's handgun rounds or any 223rem or 5.56. No problems. Semper Fi you crayon eating beast! I hope your holidays are good for you and yours, Merry Christmas.