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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Opinions on the lyman moly coating system?
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<blockquote data-quote="Max Heat" data-source="post: 650283" data-attributes="member: 43153"><p>OK, it looks like it's probably not worth the trouble then, especially considering the risks associated with excessive build-up, should it occur. But I have already purchased some "snake cream" if you will, for the bore (also a Lyman product, but way cheaper than the bullet coating system). My reasoning was that MOLY-ON-MOLY should make for an ideal slippery interface between copper jacket and bore, while at the same time slowing down the rifling lands in the throat from becoming toast. But it looks like I'll have to re-think THAT theory, if there could be possible excessive build-up issues, and cooling of the charge, which apparently is what reduces the velocity. </p><p></p><p>What I see coming out in the wash here is that in the throat, where the heat is most intense, the stuff will burn up, offering no protection to the rifling lands. But progressing towards the muzzle, less-and-less of it will burn up, and more-and-more will build up, increasing the possibility of things going TOO tight, resulting in excessive pressure. But if that's the way it goes down, a "choke" effect would be formed inside of the bore, possibly offsetting the accuracy loss caused by the toasting and rub-off of the lands in the throat. But I dunno, sometimes I tend to over-think stuff like this.</p><p></p><p>As of now, I know nothing about WS2 or HBN. Looks like I'll have to spend some time looking into them. I have used PTFE-based bore treatment (Action Product's Friction Block) occasionally though, and I still have some left in the bottle that I purchased from Bob Hart, 15 or 20 years ago. I can still remember the way he used his fingers to form a circle that went from big to small, saying how it will make my group sizes shrink. But the stuff doesn't seem to be on the market any more. I take it that the reason is that you could also run into excessive buildup issues with that stuff.</p></blockquote><p></p>
[QUOTE="Max Heat, post: 650283, member: 43153"] OK, it looks like it's probably not worth the trouble then, especially considering the risks associated with excessive build-up, should it occur. But I have already purchased some "snake cream" if you will, for the bore (also a Lyman product, but way cheaper than the bullet coating system). My reasoning was that MOLY-ON-MOLY should make for an ideal slippery interface between copper jacket and bore, while at the same time slowing down the rifling lands in the throat from becoming toast. But it looks like I'll have to re-think THAT theory, if there could be possible excessive build-up issues, and cooling of the charge, which apparently is what reduces the velocity. What I see coming out in the wash here is that in the throat, where the heat is most intense, the stuff will burn up, offering no protection to the rifling lands. But progressing towards the muzzle, less-and-less of it will burn up, and more-and-more will build up, increasing the possibility of things going TOO tight, resulting in excessive pressure. But if that's the way it goes down, a "choke" effect would be formed inside of the bore, possibly offsetting the accuracy loss caused by the toasting and rub-off of the lands in the throat. But I dunno, sometimes I tend to over-think stuff like this. As of now, I know nothing about WS2 or HBN. Looks like I'll have to spend some time looking into them. I have used PTFE-based bore treatment (Action Product's Friction Block) occasionally though, and I still have some left in the bottle that I purchased from Bob Hart, 15 or 20 years ago. I can still remember the way he used his fingers to form a circle that went from big to small, saying how it will make my group sizes shrink. But the stuff doesn't seem to be on the market any more. I take it that the reason is that you could also run into excessive buildup issues with that stuff. [/QUOTE]
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Opinions on the lyman moly coating system?
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