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<blockquote data-quote="nralifer" data-source="post: 2938704" data-attributes="member: 94556"><p>Here is a F/U on the 308 light for caliber bullet project. The project took an unsuspected turn, like new projects sometimes tend to do. The 125 gr prototype bullet on gel testing did not prove reliable enough at expanding as a second bullet we also made weighing 136 grains. The two bullets were identical in length but differed in hollow point cavity design, with the 136 gr having our conventional design and the 125 gr bullet, having a wider and deeper hollow cavity design and notched at the mouth that required a thicker stem on the tip. Turns out the thick stem did not clear the hollow as readily as our conventional thinner stem used in the 136 gr prototype bullet, thus the reliability of expansion of the 125 gr bullet was not as great as that of the 136 gr prototype bullet. We decided to go with the 136 gr bullet instead. The extra 11 grains also increased the BC to the point that it exceeded most 150gr lead core bullets including Bergers. The 136gr 308BD2 G1= 0.414 and the G7= 0.218. Using 53 gr of LVR powder from a 24" 1:9 Bartlein barrel 3300 fps can be obtained with out showing pressure signs with a bullet jump of 0.025". Accuracy is excellent (achieving 0.28 MOA three shot groups with minimal load development), and expansion at 2300 fps impact velocity is full, making this light bullet effective to 500-600 yds depending on altitude. Penetration in 10% clear gel was 24". See pics below.</p></blockquote><p></p>
[QUOTE="nralifer, post: 2938704, member: 94556"] Here is a F/U on the 308 light for caliber bullet project. The project took an unsuspected turn, like new projects sometimes tend to do. The 125 gr prototype bullet on gel testing did not prove reliable enough at expanding as a second bullet we also made weighing 136 grains. The two bullets were identical in length but differed in hollow point cavity design, with the 136 gr having our conventional design and the 125 gr bullet, having a wider and deeper hollow cavity design and notched at the mouth that required a thicker stem on the tip. Turns out the thick stem did not clear the hollow as readily as our conventional thinner stem used in the 136 gr prototype bullet, thus the reliability of expansion of the 125 gr bullet was not as great as that of the 136 gr prototype bullet. We decided to go with the 136 gr bullet instead. The extra 11 grains also increased the BC to the point that it exceeded most 150gr lead core bullets including Bergers. The 136gr 308BD2 G1= 0.414 and the G7= 0.218. Using 53 gr of LVR powder from a 24” 1:9 Bartlein barrel 3300 fps can be obtained with out showing pressure signs with a bullet jump of 0.025”. Accuracy is excellent (achieving 0.28 MOA three shot groups with minimal load development), and expansion at 2300 fps impact velocity is full, making this light bullet effective to 500-600 yds depending on altitude. Penetration in 10% clear gel was 24”. See pics below. [/QUOTE]
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