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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Sierra 30 Cal. Jackets - Information
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<blockquote data-quote="Kevin Thomas" data-source="post: 346469" data-attributes="member: 15748"><p>Roy, </p><p>I know the feeling, and I feel your pain! Sounds like a worthy endeavor, but as you noted, not one that the major makers are likely to bother with. Besides, most (including Sierra) are having enough trouble just keeping their heads above water in routine production these days. There may be some issue of "set in their ways" but mostly, it just comes down to a matter of return on investment. Most don't want to be the first to dive in and find out just how frigid the waters may be. After suggesting them I had a major fight to get the 77s and 80s (.224" MKs) into production, since none of the other major makers were producing anything similar. Smaller makers like JLK were already cleaning up on them, but it's hard to get the Titanic to make a sharp turn like that, if you know what I mean.</p><p> </p><p>Sierra uses standard 95/5 gilding metal for their jackets, but I suspect you were already aware of that. A thicker jacket may be a solution here, but have you seen the stuff that Eric Stecker of Berger posted about bullet blow-ups? Berger had some issues with this some time back, and revamped their jackets to deal with the situation. Eric took the question to MIT and invested some serious $ in determining precisely what was going on. In the end, it seems that heat transfer is the culprit, not just jacket thickness per se. So, anything that may result in developing/transfering less heat to the jacket may also be of assistance in keeping things together. As far as the difference in heat transfer between pure copper and 95/5 gilding metal, that might be interesting. </p><p> </p><p>Keep me posted hre, you've got me curious now!</p><p> </p><p>Kevin</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 346469, member: 15748"] Roy, I know the feeling, and I feel your pain! Sounds like a worthy endeavor, but as you noted, not one that the major makers are likely to bother with. Besides, most (including Sierra) are having enough trouble just keeping their heads above water in routine production these days. There may be some issue of "set in their ways" but mostly, it just comes down to a matter of return on investment. Most don't want to be the first to dive in and find out just how frigid the waters may be. After suggesting them I had a major fight to get the 77s and 80s (.224" MKs) into production, since none of the other major makers were producing anything similar. Smaller makers like JLK were already cleaning up on them, but it's hard to get the Titanic to make a sharp turn like that, if you know what I mean. Sierra uses standard 95/5 gilding metal for their jackets, but I suspect you were already aware of that. A thicker jacket may be a solution here, but have you seen the stuff that Eric Stecker of Berger posted about bullet blow-ups? Berger had some issues with this some time back, and revamped their jackets to deal with the situation. Eric took the question to MIT and invested some serious $ in determining precisely what was going on. In the end, it seems that heat transfer is the culprit, not just jacket thickness per se. So, anything that may result in developing/transfering less heat to the jacket may also be of assistance in keeping things together. As far as the difference in heat transfer between pure copper and 95/5 gilding metal, that might be interesting. Keep me posted hre, you've got me curious now! Kevin [/QUOTE]
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Sierra 30 Cal. Jackets - Information
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