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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Sherman Build (This Is My Boomstick!)
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<blockquote data-quote="benchracer" data-source="post: 1342801" data-attributes="member: 22069"><p><strong>CUTTING EDGE 252 MTH</strong></p><p><strong></strong></p><p>Applied Ballistics testing has established a G7 bc of .366 for this bullet, which is slightly higher than the Berger 250 EH. Based on prior testing with MTH bullets in .375, it has also been my experience that these bullets can typically be driven faster than comparable cup-and-core bullets, because of their seal-tite band and bore rider design. With that in mind, my test results with the 250 EH and RL-26 had me expecting the 252 MTH to pressure out in the low 2900's. In this case, with this powder, I believe the low bore resistance of the MTH design prevented it from building enough initial pressure to reach the velocity potential of this bullet. Packed with every last kernel of RL-26 that would fit in the case, a highly compressed charge of 72.0 grains topped out at 2865, with a shiny ejector mark, but no heavy bolt lift or hard extraction. I intend to re-test the 252 MTH with RL-17 to see how it behaves with a faster powder.</p><p></p><p><u>RL-26 (Win LR Mag primers)</u></p><p>68.0 2770</p><p>69.0 2777</p><p>70.0 2815</p><p>71.0 2852</p><p>72.0 2865 Shiny ejector mark.</p></blockquote><p></p>
[QUOTE="benchracer, post: 1342801, member: 22069"] [B]CUTTING EDGE 252 MTH [/B] Applied Ballistics testing has established a G7 bc of .366 for this bullet, which is slightly higher than the Berger 250 EH. Based on prior testing with MTH bullets in .375, it has also been my experience that these bullets can typically be driven faster than comparable cup-and-core bullets, because of their seal-tite band and bore rider design. With that in mind, my test results with the 250 EH and RL-26 had me expecting the 252 MTH to pressure out in the low 2900's. In this case, with this powder, I believe the low bore resistance of the MTH design prevented it from building enough initial pressure to reach the velocity potential of this bullet. Packed with every last kernel of RL-26 that would fit in the case, a highly compressed charge of 72.0 grains topped out at 2865, with a shiny ejector mark, but no heavy bolt lift or hard extraction. I intend to re-test the 252 MTH with RL-17 to see how it behaves with a faster powder. [U]RL-26 (Win LR Mag primers)[/U] 68.0 2770 69.0 2777 70.0 2815 71.0 2852 72.0 2865 Shiny ejector mark. [/QUOTE]
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338 Sherman Build (This Is My Boomstick!)
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