Yep any moisture anywhere + moly = corrosion
I don't know how much good HBN does, I have been using it for years, after hurting barrels with Moly.
I clean bugger all & once the rifle has settled down basically no copper fouling is evident even after 100-200+ rounds depending on calibre.
I don't really notice any carbon build up, although I don't have a bore scope yet, but don't know if I want one........
I have noticed that I have quite a few rifles now with silly single digit ES (more often that not), especially with mucking around with neck tension.
I haven't read or seen anything bad about HBN so I will keep coating all the pills for my own rifles, I'm careful not to use coated pills for customers rifles.
I haven't done enough testing yet to see how much difference it makes yet but will grab a nice consistent rifle & load to try with & without HBN.
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