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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Lija 1:7 30cal
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<blockquote data-quote="AZShooter" data-source="post: 1624813" data-attributes="member: 5219"><p>A friend and I had a bad experience with 1 in 7 twist 3 groove 7mms. In short order Dan's 7 STW damaged the 180 berger hunting bullets causing them to land way off the mark at 100 yds at just over 100 rounds through the barrel. Same for my 7 rem mag with round count a right around 200. At the advise of Bryan Litz I switched to 180 target bullets which lasted another 100 rounds or so then the accuracy died again. Moved to monos or bonded which held together.</p><p></p><p>In contrast had a 1 in 7.5 5R 6mm-284 that never had an issue for the life of the barrel with either 107 SMK or 105 Berger hybrids.</p><p></p><p>IMO high RPMs combined with a 3 groove is a recipe for disaster.</p><p></p><p> </p><p>RPM formula: (MV x 720) divided by twist</p><p></p><p>7 Rem mag 303,428</p><p>7 STW 318, 857</p><p>6mm-284 with 105s 336,000 107 SMK 331,200</p><p>The 5R had higher RPMs but never had an issue.</p><p></p><p>I agree with NEMThunter get a 5R and stay away from fast twist 3 groove barrels.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1624813, member: 5219"] A friend and I had a bad experience with 1 in 7 twist 3 groove 7mms. In short order Dan's 7 STW damaged the 180 berger hunting bullets causing them to land way off the mark at 100 yds at just over 100 rounds through the barrel. Same for my 7 rem mag with round count a right around 200. At the advise of Bryan Litz I switched to 180 target bullets which lasted another 100 rounds or so then the accuracy died again. Moved to monos or bonded which held together. In contrast had a 1 in 7.5 5R 6mm-284 that never had an issue for the life of the barrel with either 107 SMK or 105 Berger hybrids. IMO high RPMs combined with a 3 groove is a recipe for disaster. RPM formula: (MV x 720) divided by twist 7 Rem mag 303,428 7 STW 318, 857 6mm-284 with 105s 336,000 107 SMK 331,200 The 5R had higher RPMs but never had an issue. I agree with NEMThunter get a 5R and stay away from fast twist 3 groove barrels. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Lija 1:7 30cal
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