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Rifles, Reloading, Optics, Equipment
Reloading
338 rum & rl-26 ?
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<blockquote data-quote="Pdvdh" data-source="post: 1292101" data-attributes="member: 4191"><p>I never gave it any thought when I posted. I provided the data from my rifle in 338 LI as a comparable point of interest. It seems like a lot of additional powder for the extra 190fps, but I believe that's typical. Larger capacity cases will yield higher MV at equal pressures, but the additional MV & energy are obtained less efficiently than in cases with less capacity. Which is why proponents of smaller capacity cases are quick to point to how efficient their cartridges are.</p><p></p><p>Divide my muzzle velocity my powder charge weight; 2945fps/105.3gr = <strong>27.97</strong>fps/gr RL33.</p><p></p><p>Divide your MV by your powder charge; 2750fps/93.0gr = <strong>29.57</strong>fps/gr RL33.</p><p></p><p>Your 338RUM yields <strong>1.6</strong>fps additional MV per grain of RL33 burned in your smaller cartridge case. More efficient.</p><p></p><p>In all likelihood, I'm also running higher pressures than you. I have a BAT action and I'm using Lapua cases. They'll both digest high pressure without much evidence/affect. I ran my pressures up till I experienced some bolt lift resistance while ejecting fired brass, than backed off just a little. That load shot good enough for me with acceptable ES/SD, and I left it at that. Haven't done near the load development you've described. Only bullet I've ever loaded is the 300gr OTM.</p><p></p><p>I read the late Elmer Keith articles where he'd say he didn't give a **** about efficiency. The only number that mattered to him was the MV. I don't go that far, but he made his point. I don't shoot my rifle enough for concern over barrel life or the increased cost of burning the additional powder. However I have no plan to (or interest in) move into the 150gr powder capacity Cheytac case. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1292101, member: 4191"] I never gave it any thought when I posted. I provided the data from my rifle in 338 LI as a comparable point of interest. It seems like a lot of additional powder for the extra 190fps, but I believe that's typical. Larger capacity cases will yield higher MV at equal pressures, but the additional MV & energy are obtained less efficiently than in cases with less capacity. Which is why proponents of smaller capacity cases are quick to point to how efficient their cartridges are. Divide my muzzle velocity my powder charge weight; 2945fps/105.3gr = [B]27.97[/B]fps/gr RL33. Divide your MV by your powder charge; 2750fps/93.0gr = [B]29.57[/B]fps/gr RL33. Your 338RUM yields [B]1.6[/B]fps additional MV per grain of RL33 burned in your smaller cartridge case. More efficient. In all likelihood, I'm also running higher pressures than you. I have a BAT action and I'm using Lapua cases. They'll both digest high pressure without much evidence/affect. I ran my pressures up till I experienced some bolt lift resistance while ejecting fired brass, than backed off just a little. That load shot good enough for me with acceptable ES/SD, and I left it at that. Haven't done near the load development you've described. Only bullet I've ever loaded is the 300gr OTM. I read the late Elmer Keith articles where he'd say he didn't give a **** about efficiency. The only number that mattered to him was the MV. I don't go that far, but he made his point. I don't shoot my rifle enough for concern over barrel life or the increased cost of burning the additional powder. However I have no plan to (or interest in) move into the 150gr powder capacity Cheytac case. :) [/QUOTE]
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Reloading
338 rum & rl-26 ?
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