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Bullets Spinning Apart
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<blockquote data-quote="AZShooter" data-source="post: 1686462" data-attributes="member: 5219"><p>At while ago, I had a 1 in 7 3 groove in 7 Rem mag. A friend built a 7 STW with same barrel configuration. We both shot 180 VLDs. The 7 STW began to damage bullet jackets at round count 150 or so. His bullets would diverge from POI by inches at 100 yds. Mine did the same thing at just over 200 rounds. </p><p></p><p>I emailed Bryan Litz and he suggested I switch to 180 target VLDs with their heavier jackets. That helped for a while then the bullets would show signs of damage and shoot several inches off POI at 100 yds. I tried moly coating the bullets and it worked for a while. </p><p></p><p> Other members told me before I built the rifle not to use a 3 groove with such a fast twist and they were right. The 3 groove is the issue as it damaged the jackets in the throat area once it got rough. Accubonds and TTSX bullets shot fine in that barrel after I quit using the VLDs. </p><p></p><p>RPMs:</p><p>7 mag 180 VLD @ 2950 fps 303,428</p><p>7 STW " @ 3100 fps 318,857</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1686462, member: 5219"] At while ago, I had a 1 in 7 3 groove in 7 Rem mag. A friend built a 7 STW with same barrel configuration. We both shot 180 VLDs. The 7 STW began to damage bullet jackets at round count 150 or so. His bullets would diverge from POI by inches at 100 yds. Mine did the same thing at just over 200 rounds. I emailed Bryan Litz and he suggested I switch to 180 target VLDs with their heavier jackets. That helped for a while then the bullets would show signs of damage and shoot several inches off POI at 100 yds. I tried moly coating the bullets and it worked for a while. Other members told me before I built the rifle not to use a 3 groove with such a fast twist and they were right. The 3 groove is the issue as it damaged the jackets in the throat area once it got rough. Accubonds and TTSX bullets shot fine in that barrel after I quit using the VLDs. RPMs: 7 mag 180 VLD @ 2950 fps 303,428 7 STW " @ 3100 fps 318,857 [/QUOTE]
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