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Rifles, Reloading, Optics, Equipment
Gunsmithing
Measuring Overall length and Throat Erosion
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<blockquote data-quote="Black Tail Hunter" data-source="post: 1345262" data-attributes="member: 59604"><p>When I first got my rifle and started load development I got a Hornady overall length gauge and made my own checker case since they did not offer one and they are simple to make.</p><p></p><p>My measurements were at around 4.012-4.015 so I loaded roughly .010 off the lands which worked fine.</p><p></p><p> I now have roughly 150-200 rounds through the gun and I decided to take another measurement to see if it had changed any and my measurement now is 4.002-4.005. This seems wrong to me but maybe my understanding of throat erosion is incorrect. I find that there are a couple possibilities but would like input from people who have more experience than me in this.</p><p></p><p>First possibility is my initial measurement was for some reason inaccurate and the 4.012-4.015 wasn't the actual dimension.</p><p></p><p>Second possibility is my understanding of the result of throat erosion, being the bullet protruding further out of the case as it chases the lands down the barrel is incorrect and the case actually goes further into the chamber?</p><p></p><p>Please weigh in as I am curious as to what the most likely answer is.</p></blockquote><p></p>
[QUOTE="Black Tail Hunter, post: 1345262, member: 59604"] When I first got my rifle and started load development I got a Hornady overall length gauge and made my own checker case since they did not offer one and they are simple to make. My measurements were at around 4.012-4.015 so I loaded roughly .010 off the lands which worked fine. I now have roughly 150-200 rounds through the gun and I decided to take another measurement to see if it had changed any and my measurement now is 4.002-4.005. This seems wrong to me but maybe my understanding of throat erosion is incorrect. I find that there are a couple possibilities but would like input from people who have more experience than me in this. First possibility is my initial measurement was for some reason inaccurate and the 4.012-4.015 wasn't the actual dimension. Second possibility is my understanding of the result of throat erosion, being the bullet protruding further out of the case as it chases the lands down the barrel is incorrect and the case actually goes further into the chamber? Please weigh in as I am curious as to what the most likely answer is. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Measuring Overall length and Throat Erosion
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