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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 rcm
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<blockquote data-quote="Autorotate" data-source="post: 540521" data-attributes="member: 8073"><p>Interesting build...that sounds like an excellent rifle for future Alaska hunt <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><p></p><p>That is very consistent velocities...factory ammo nonetheless makes it that much more special.</p><p></p><p>Varminator 911-I would guess on 18-21 fps per inch with the slightly quicker powders/200-225 gr weight bullets, and 22-27 fps per inch with slightly slower powders/250-300 gr weight bullets.</p><p></p><p>JE Custom would know best on what improvements to case capacity might be seen with a different throat. My opinion would be the biggest benefit might not necessarily be a velocity gain from an increase in capacity, but better load density with the next slower/faster powder up or down the chart.</p><p></p><p>Example-338 Lapua Ackley Improved. It sees a 11 grain increase from virgin unfired brass, to fully formed brass with 2-3 firings. The virgin cases "cube out" before you "pressure out" with Retumbo....in otherwords you can't put enough Retumbo in the case with the 300 grainers to get yourself into pressure trouble....but with H1000 you can "pressure out" before you "cube out"...and definitely get yourself in pressure trouble. After firing, the formed cases now run into pressure/load density constraint at nearly the same time with Retumbo around 103.5 to 104 grains with 300 grain bullets.</p><p></p><p>The biggest benefit from lengthening the throat on this 338 RCM, may be the same as happens above...you might be able to move into a new class of powders, where as before load density kept you from doing so.</p><p></p><p>If this is insulting to your knowledge level, I definitely didn't mean it that way at all, just sharing my perspective/experience. I'm here to learn from all the smart fellas like JE Custom on here. gun)</p></blockquote><p></p>
[QUOTE="Autorotate, post: 540521, member: 8073"] Interesting build...that sounds like an excellent rifle for future Alaska hunt :D That is very consistent velocities...factory ammo nonetheless makes it that much more special. Varminator 911-I would guess on 18-21 fps per inch with the slightly quicker powders/200-225 gr weight bullets, and 22-27 fps per inch with slightly slower powders/250-300 gr weight bullets. JE Custom would know best on what improvements to case capacity might be seen with a different throat. My opinion would be the biggest benefit might not necessarily be a velocity gain from an increase in capacity, but better load density with the next slower/faster powder up or down the chart. Example-338 Lapua Ackley Improved. It sees a 11 grain increase from virgin unfired brass, to fully formed brass with 2-3 firings. The virgin cases "cube out" before you "pressure out" with Retumbo....in otherwords you can't put enough Retumbo in the case with the 300 grainers to get yourself into pressure trouble....but with H1000 you can "pressure out" before you "cube out"...and definitely get yourself in pressure trouble. After firing, the formed cases now run into pressure/load density constraint at nearly the same time with Retumbo around 103.5 to 104 grains with 300 grain bullets. The biggest benefit from lengthening the throat on this 338 RCM, may be the same as happens above...you might be able to move into a new class of powders, where as before load density kept you from doing so. If this is insulting to your knowledge level, I definitely didn't mean it that way at all, just sharing my perspective/experience. I'm here to learn from all the smart fellas like JE Custom on here. gun) [/QUOTE]
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338 rcm
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