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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hex Boron Nitride question
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<blockquote data-quote="royinidaho" data-source="post: 1068110" data-attributes="member: 2011"><p>The effect of less friction is as the bullets slides easier pressure goes down resulting in less velocity.</p><p></p><p>Remedies are to increase powder charge to attain the same pressure thus the same velocity.</p><p></p><p>The "free bore" is a bit more involved.</p><p></p><p>Freebore can be said to be the distance from the front of the neck to where rifling starts.</p><p></p><p>To change "freebore" means to rechamber with a different throat reamer.</p><p></p><p>However, the work around is to simply seat the bullets longer. The net effect is increased effective case volume.</p><p></p><p>Increased case volume + HBN reduced friction means an even greater powder charge is possible with a significant increase in velocity.</p><p></p><p>Ya gotta sneak up on things fairly conservatively otherwise there may be some not so fun experiences.</p><p></p><p>Hope this helps.</p></blockquote><p></p>
[QUOTE="royinidaho, post: 1068110, member: 2011"] The effect of less friction is as the bullets slides easier pressure goes down resulting in less velocity. Remedies are to increase powder charge to attain the same pressure thus the same velocity. The "free bore" is a bit more involved. Freebore can be said to be the distance from the front of the neck to where rifling starts. To change "freebore" means to rechamber with a different throat reamer. However, the work around is to simply seat the bullets longer. The net effect is increased effective case volume. Increased case volume + HBN reduced friction means an even greater powder charge is possible with a significant increase in velocity. Ya gotta sneak up on things fairly conservatively otherwise there may be some not so fun experiences. Hope this helps. [/QUOTE]
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Hex Boron Nitride question
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