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Berger VLD performance on bone question...
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<blockquote data-quote="RockyMtnMT" data-source="post: 1357393" data-attributes="member: 7999"><p>Be careful with thinking the Barnes bullets are tested to be fully stable in factory twist rates. Many that I have checked, particularly the ones that are relatively similar to lead core bullets for weight and caliber, are quite marginal for stability. All copper mono bullets have to be longer than the same weight lead core bullets of the similar design. Just physics, copper is less dense, and the only way to gain weight is to make them longer. Stability is a ratio of bullet length, weight, and rate of spin.</p><p></p><p>There are a couple of good places to check bullet stability of bullets. JBM Ballistics or the Berger site have stability calculators. You will need the dimensions of the bullet that you want to check.</p><p></p><p>Many bullets are marketed for factory common twist as a stable option. Remember that there is a big difference in stable for flight and stable for terminal performance. Accuracy can be very good with marginal stability. According to Litz the bc of the bullet will suffer if stability is less than 1.5sg.</p><p></p><p>You are right on the money with the factory rifles being slow for many of the heavy bullet being marketed. The .25's, the old .264's with 9" twist, many of the 7mm are 9.5" or 10", new Tikka 30's are 11". It is difficult to find dimensions on bullets let alone a recommendation of twist rate for a given bullet from the manufactures. It is a buyer beware market.</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 1357393, member: 7999"] Be careful with thinking the Barnes bullets are tested to be fully stable in factory twist rates. Many that I have checked, particularly the ones that are relatively similar to lead core bullets for weight and caliber, are quite marginal for stability. All copper mono bullets have to be longer than the same weight lead core bullets of the similar design. Just physics, copper is less dense, and the only way to gain weight is to make them longer. Stability is a ratio of bullet length, weight, and rate of spin. There are a couple of good places to check bullet stability of bullets. JBM Ballistics or the Berger site have stability calculators. You will need the dimensions of the bullet that you want to check. Many bullets are marketed for factory common twist as a stable option. Remember that there is a big difference in stable for flight and stable for terminal performance. Accuracy can be very good with marginal stability. According to Litz the bc of the bullet will suffer if stability is less than 1.5sg. You are right on the money with the factory rifles being slow for many of the heavy bullet being marketed. The .25's, the old .264's with 9" twist, many of the 7mm are 9.5" or 10", new Tikka 30's are 11". It is difficult to find dimensions on bullets let alone a recommendation of twist rate for a given bullet from the manufactures. It is a buyer beware market. Steve [/QUOTE]
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