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Rifles, Reloading, Optics, Equipment
Reloading
My HBN experience and process
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<blockquote data-quote="Calvin45" data-source="post: 2913282" data-attributes="member: 109862"><p>Agree. "Friction". "Drag". Not exactly the same but very much a part of why hbn and other friction reducing coatings affect interior ballistics is the concept of "engraving pressure". There is no point during the firing of a cartridge I don't think where the pressure is gonna spike as hard, high, and abruptly as when that bullet is first forced into the rifling (only thing I can think of might be if you used a ridiculously strong crimp on a long necked case with a high bearing surface bullet, maybe glued it in there too <img class="smilie smilie--emoji" loading="lazy" alt="🤣" title="Rolling on the floor laughing :rofl:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f923.png" data-shortname=":rofl:" /> - or cold weld, whatever that is <img class="smilie smilie--emoji" loading="lazy" alt="🥴" title="Woozy face :woozy_face:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f974.png" data-shortname=":woozy_face:" /> - the initial release from the case might be pretty dang high too)</p><p></p><p>Whether they're right or not, it is of note that Winchester/Nosler combined technology lubalox bullets are overtly advertised as "reducing engraving pressure" with that layer of black copper oxide. And I do think that's why hbn treated bullets, ESPECIALLY those bullets known for pressuring up fast like the original ungrooved Barnes x and the pure copper jacketed scirocco 2, exhibit a lot less sensitivity to seating depth than naked bullets in my real experience. That initial pressure spike curve is made gentler I think. No proof. Just what makes sense to me and seems to jive with observed effects. </p><p></p><p>I am not a match shooter or competitor or elr sniper or anything. I've heard those types say that they didn't find hbn imparted any benefit worth the trouble and I believe them wholeheartedly. I also don't think match type bullets stand to benefit from this treatment as much as stout jacketed long bearing surface type hunting bullets but again, just my opinion. I also don't see it being nearly as beneficial in moderate case to bore ratio cartridges (again, the type competitors typically use) as it truly has shown itself to be for me in more overbore cartridges. It makes a number of real notable differences, all for the better, for me in my .243, .257 wby, and .300 win mag. I don't mess with it in rounds like .308, 8mm Mauser, and .358 Norma mag. Just don't see much point there.</p></blockquote><p></p>
[QUOTE="Calvin45, post: 2913282, member: 109862"] Agree. “Friction”. “Drag”. Not exactly the same but very much a part of why hbn and other friction reducing coatings affect interior ballistics is the concept of “engraving pressure”. There is no point during the firing of a cartridge I don’t think where the pressure is gonna spike as hard, high, and abruptly as when that bullet is first forced into the rifling (only thing I can think of might be if you used a ridiculously strong crimp on a long necked case with a high bearing surface bullet, maybe glued it in there too 🤣 - or cold weld, whatever that is 🥴 - the initial release from the case might be pretty dang high too) Whether they’re right or not, it is of note that Winchester/Nosler combined technology lubalox bullets are overtly advertised as “reducing engraving pressure” with that layer of black copper oxide. And I do think that’s why hbn treated bullets, ESPECIALLY those bullets known for pressuring up fast like the original ungrooved Barnes x and the pure copper jacketed scirocco 2, exhibit a lot less sensitivity to seating depth than naked bullets in my real experience. That initial pressure spike curve is made gentler I think. No proof. Just what makes sense to me and seems to jive with observed effects. I am not a match shooter or competitor or elr sniper or anything. I’ve heard those types say that they didn’t find hbn imparted any benefit worth the trouble and I believe them wholeheartedly. I also don’t think match type bullets stand to benefit from this treatment as much as stout jacketed long bearing surface type hunting bullets but again, just my opinion. I also don’t see it being nearly as beneficial in moderate case to bore ratio cartridges (again, the type competitors typically use) as it truly has shown itself to be for me in more overbore cartridges. It makes a number of real notable differences, all for the better, for me in my .243, .257 wby, and .300 win mag. I don’t mess with it in rounds like .308, 8mm Mauser, and .358 Norma mag. Just don’t see much point there. [/QUOTE]
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My HBN experience and process
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