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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
High Velocity Throat Erosion
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<blockquote data-quote="Jeff Heeg osoh" data-source="post: 2596682" data-attributes="member: 111250"><p>Its interesting what we experience in time as shooters and reloaders.</p><p></p><p>Got my first click boom hang fire in the 375 VM2 with 146 grains of US861 and federal large rifle magnum primers. It gets your attention. The 375 VM2 was a 585 African necked down to a 375. *Tested H50BMG, RL50 and US869 in this rifle</p><p></p><p></p><p>Worst for throat erosion I experienced was a 375 pushing a 400 grain bullet at 3390 fps , 45 rounds equaled 108 thou of throat erosion. Used 193.5 grains of US869 in a case that was a 50 cal shortened up some. Even though a throat eroder it did get us in and through the top ten in the KO2M finale. Kinda like a dragster changing tires and barrels in a hot rod rifle or car.</p><p>*Just wanted to add we went from H50BMG to the US869 to slow down the effects of the throat eroding, the H50BMG was worse on a different barrel prior.</p><p></p><p></p><p> We opened up the bore to a 416 and now very minimal throat erosion pushing the 550 gr. at 3060 fps - used 192.5 grains of 20N29 same 50 cal case that was shortened up with the necks expanded back out to a 416 versus 375. Very happy with 416 as far as barrel life and accuracy - we could push it faster in 2020 we were running the 550s at 3120 with excellent brass primer pocket life but in 2021 we decided to run with a great accuracy node that was in the 3060 range just because we feel speed just is not as big of a deal while managing all of our resources yet still be a threat in the ELR world.</p><p></p><p></p><p>Cheers</p><p>JH</p></blockquote><p></p>
[QUOTE="Jeff Heeg osoh, post: 2596682, member: 111250"] Its interesting what we experience in time as shooters and reloaders. Got my first click boom hang fire in the 375 VM2 with 146 grains of US861 and federal large rifle magnum primers. It gets your attention. The 375 VM2 was a 585 African necked down to a 375. *Tested H50BMG, RL50 and US869 in this rifle Worst for throat erosion I experienced was a 375 pushing a 400 grain bullet at 3390 fps , 45 rounds equaled 108 thou of throat erosion. Used 193.5 grains of US869 in a case that was a 50 cal shortened up some. Even though a throat eroder it did get us in and through the top ten in the KO2M finale. Kinda like a dragster changing tires and barrels in a hot rod rifle or car. *Just wanted to add we went from H50BMG to the US869 to slow down the effects of the throat eroding, the H50BMG was worse on a different barrel prior. We opened up the bore to a 416 and now very minimal throat erosion pushing the 550 gr. at 3060 fps - used 192.5 grains of 20N29 same 50 cal case that was shortened up with the necks expanded back out to a 416 versus 375. Very happy with 416 as far as barrel life and accuracy - we could push it faster in 2020 we were running the 550s at 3120 with excellent brass primer pocket life but in 2021 we decided to run with a great accuracy node that was in the 3060 range just because we feel speed just is not as big of a deal while managing all of our resources yet still be a threat in the ELR world. Cheers JH [/QUOTE]
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High Velocity Throat Erosion
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