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Rifles, Reloading, Optics, Equipment
Gunsmithing
Bought braked rifle, bullets keyholing!
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<blockquote data-quote="NesikaChad" data-source="post: 344728" data-attributes="member: 7449"><p>As mentioned the first step is verifying what twist you have.</p><p></p><p>Two things are going to cause a projectile to impact on it's profile. either insufficient twist or a collision between the bullet and something outside of the barrel. (in this case your brake)</p><p></p><p>A brake will show signs of this right away. If you have bright shiny copper streaks then you know it's this.</p><p></p><p>Measuring the twist of a barrel is as complicated as a cleaning rod, a tape measure, piece of tape, and 5 minutes of your time.</p><p></p><p>Shove a patch in the bore till it bites. Make a flag with a piece of tape back by the handle of the cleaning rod. Be sure to attach it to the rod and not the handle. Measure the distance from the back of the handle to the rear most part of the tang. Just eye ball it and get it close.</p><p></p><p>Now push your rod through until your flag makes one complete rotation. Measure again using the same procedure. Subtract one from the other and you have your ROT.</p><p></p><p>If your shooting the heavy 30 caliber bullets in anything less than a 10ROT then that is your likely culprit. Be sure to check the brake though as it could be a combination of the two.</p><p></p><p>Good luck,</p><p></p><p>Chad</p></blockquote><p></p>
[QUOTE="NesikaChad, post: 344728, member: 7449"] As mentioned the first step is verifying what twist you have. Two things are going to cause a projectile to impact on it's profile. either insufficient twist or a collision between the bullet and something outside of the barrel. (in this case your brake) A brake will show signs of this right away. If you have bright shiny copper streaks then you know it's this. Measuring the twist of a barrel is as complicated as a cleaning rod, a tape measure, piece of tape, and 5 minutes of your time. Shove a patch in the bore till it bites. Make a flag with a piece of tape back by the handle of the cleaning rod. Be sure to attach it to the rod and not the handle. Measure the distance from the back of the handle to the rear most part of the tang. Just eye ball it and get it close. Now push your rod through until your flag makes one complete rotation. Measure again using the same procedure. Subtract one from the other and you have your ROT. If your shooting the heavy 30 caliber bullets in anything less than a 10ROT then that is your likely culprit. Be sure to check the brake though as it could be a combination of the two. Good luck, Chad [/QUOTE]
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Bought braked rifle, bullets keyholing!
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