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Rifles, Reloading, Optics, Equipment
Reloading
Absolute Hammer load data
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<blockquote data-quote="Calvin45" data-source="post: 2577990" data-attributes="member: 109862"><p>Okay that's super interesting…im forming some experienc based opinion/theory about internal ballistics based on findings. </p><p></p><p>The secret to hammer bullets being able to achieve higher vel before hitting pressure is entirely in the reduced total bearing surface because of their geometry. That's not theory that's just plainly so. </p><p></p><p>But I've observed that light weight monos of non hammer geometry can also be loaded to significantly higher foot pounds of muzzle energy than heavier pills before hitting any signs. I don't fully understand why but suspect it's all about bearing surface and pressure spikes. </p><p></p><p>I have a .300 win mag load featuring a hbn coated 120 Barnes tac at 4050 fps. That's basically 4400 foot pounds. Hot. Easy one finger bolt lift. Case dribbles oit, no extractor mark, no cratering, no loosening of the pocket, no excessive case growth or web expansion as deduced via micrometer. 2.5 grains above this load I had a sooty case head! No other pressure signs even then. </p><p></p><p>I have loads with the 225 eld m that are abojt 2800 fps and 3800 foot pounds. Very safe. But big extractor spot on those. </p><p></p><p>Interesting. The trick is the hammers can have the minimal bearing surface of a lightweight even with long heavy bullets too.</p></blockquote><p></p>
[QUOTE="Calvin45, post: 2577990, member: 109862"] Okay that’s super interesting…im forming some experienc based opinion/theory about internal ballistics based on findings. The secret to hammer bullets being able to achieve higher vel before hitting pressure is entirely in the reduced total bearing surface because of their geometry. That’s not theory that’s just plainly so. But I’ve observed that light weight monos of non hammer geometry can also be loaded to significantly higher foot pounds of muzzle energy than heavier pills before hitting any signs. I don’t fully understand why but suspect it’s all about bearing surface and pressure spikes. I have a .300 win mag load featuring a hbn coated 120 Barnes tac at 4050 fps. That’s basically 4400 foot pounds. Hot. Easy one finger bolt lift. Case dribbles oit, no extractor mark, no cratering, no loosening of the pocket, no excessive case growth or web expansion as deduced via micrometer. 2.5 grains above this load I had a sooty case head! No other pressure signs even then. I have loads with the 225 eld m that are abojt 2800 fps and 3800 foot pounds. Very safe. But big extractor spot on those. Interesting. The trick is the hammers can have the minimal bearing surface of a lightweight even with long heavy bullets too. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Absolute Hammer load data
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