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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm STW Throat Erosion Measured
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<blockquote data-quote="highdrum" data-source="post: 2247716" data-attributes="member: 13732"><p>Man that sounds like an extremely high rate of erosion. My best friends 28 nosler went at a rate of about 0.008" per 100 rounds. This was using 86gr Retumbo pushing 195s @ 3090fps. </p><p>The best way to check lands is to pull your barrel and seat a bullet long. Then drop the round into and upside down chamber pushing it into the shoulder of the case. The cartridge will likely not lift freely, use a pocket knife to pry the case up. Seat the bullet a little or a lot deeper depending on the resistance to remove the case. Once you get to a point of very little to no resistance, you should be able to pry it up with your pinky fingernail.</p><p></p><p>Another method involves stripping the bolt of the firing pin assembly, and ejector. You essentially do the same as previous method, but instead of using your finger force to remove the round from chamber, you let the weight of your bolt do the talking. Once your right at touch or a thou or two off, the bolt handle should fall **** on its own weight with zero resistance. </p><p></p><p>Always do this after you clean your barrel, as carbon build-up in the throat/freebore area will give false measurements. Horandy oal tools get you close but more than likely what a person calls lands with Horandy tools is probably jammed anywhere from 5 to 10 thou.</p></blockquote><p></p>
[QUOTE="highdrum, post: 2247716, member: 13732"] Man that sounds like an extremely high rate of erosion. My best friends 28 nosler went at a rate of about 0.008" per 100 rounds. This was using 86gr Retumbo pushing 195s @ 3090fps. The best way to check lands is to pull your barrel and seat a bullet long. Then drop the round into and upside down chamber pushing it into the shoulder of the case. The cartridge will likely not lift freely, use a pocket knife to pry the case up. Seat the bullet a little or a lot deeper depending on the resistance to remove the case. Once you get to a point of very little to no resistance, you should be able to pry it up with your pinky fingernail. Another method involves stripping the bolt of the firing pin assembly, and ejector. You essentially do the same as previous method, but instead of using your finger force to remove the round from chamber, you let the weight of your bolt do the talking. Once your right at touch or a thou or two off, the bolt handle should fall **** on its own weight with zero resistance. Always do this after you clean your barrel, as carbon build-up in the throat/freebore area will give false measurements. Horandy oal tools get you close but more than likely what a person calls lands with Horandy tools is probably jammed anywhere from 5 to 10 thou. [/QUOTE]
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7mm STW Throat Erosion Measured
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