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Rifles, Reloading, Optics, Equipment
Gunsmithing
Need some advise
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<blockquote data-quote="NesikaChad" data-source="post: 378443" data-attributes="member: 7449"><p>One must never forget one little thing about long skinny bullets.</p><p></p><p>RPM and twist rates, although not the same thing, share a symbiont relationship</p><p></p><p>You calculator geniuses should make pretty quick work of this. Lets wave a magic wand and speculate that a 338 or 378 squished down to 7mm will dabble in the high 3000 to low 4000 fps velocity figures. Any "lawn dart" weight 7mm bullet is going to require a pretty aggressive twist rate to stabilize properly.</p><p></p><p>At these kinds of velocities the bullet will be buzzing along somewhere in the neighborhood of 300,000 rpm. </p><p></p><p>It's a tall order for the jacket of any bullet to tolerate this kind of centrifugal force. A guy can slow the twist a bit to compensate but I think the gun becomes a bit more fussy as to what it'll shoot well.</p><p></p><p>Just something to consider before whippin out that checkbook.</p><p></p><p>Good luck.</p><p></p><p>Hey Jan, go shoot your gun!<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>
[QUOTE="NesikaChad, post: 378443, member: 7449"] One must never forget one little thing about long skinny bullets. RPM and twist rates, although not the same thing, share a symbiont relationship You calculator geniuses should make pretty quick work of this. Lets wave a magic wand and speculate that a 338 or 378 squished down to 7mm will dabble in the high 3000 to low 4000 fps velocity figures. Any "lawn dart" weight 7mm bullet is going to require a pretty aggressive twist rate to stabilize properly. At these kinds of velocities the bullet will be buzzing along somewhere in the neighborhood of 300,000 rpm. It's a tall order for the jacket of any bullet to tolerate this kind of centrifugal force. A guy can slow the twist a bit to compensate but I think the gun becomes a bit more fussy as to what it'll shoot well. Just something to consider before whippin out that checkbook. Good luck. Hey Jan, go shoot your gun!:D [/QUOTE]
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