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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6mm Creedmoor barrel twist?
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<blockquote data-quote="Hugnot" data-source="post: 3098973" data-attributes="member: 115658"><p>The OP made no mention of how he will use the 6mm CM.</p><p></p><p>The 6mm CM is one of my favorite rounds. I shoot about 3500 rounds per year & primer availability is a consideration, & SRP's are an easy buy at LGS and I use them in the 6mm CM, no problems with extruded powders. I like to shoot rodents, small targets, at various ranges.</p><p></p><p> I am working on 80 grain H ELDMVT (low FF & thin jackets) loads for the 6mm CM and have had no problems with bullet blow ups yet @ 3400 fps, 8 twist, fair accuracy, real flat trajectories . I got over 3,600 fps with a 6mm AI, 10 twist, no blow ups but poor accuracy, despite Miller Sg estimates of adequate plastic tip stability, this also occurred in other rifles. The Miller Sg estimation works good with many bullets, except the new ELDMVT's that have large empty voids under the plastic tip.</p><p></p><p>The Miller analysis has doubts about fine accuracy when Sg values are over 2.0. I would not want to buy 1,000 or so bullets that proved to be inadequate for my use so I pay attention to Miller. I like to buy bullets in 500 lots but only after shooting 100 & doing some simple stat work. Fast twist rates & high velocity magnify any bullet imbalance/defect & result in a sad buyer's remorse (waste) should money be spent on 1,000 bullets. I look at an Sg value that will assure best performance with an intended bullet at all conditions. Occasionally, I get to buy bullets that were rejected for various reasons including accuracy problems, like improper twist rate for bullet. My favorite & cheap 6mm bullet is the 105 Barnes Match burner @ 3,000 fps, Sg in the 1.6 range, 8 twist. </p><p></p><p> The smaller 6mm Dasher using 105 Berger VLD's with 7.5 twist is a frequent winner at local 1000 YD BR matches, Sg 1.64 @ most temps, elevation 3500, about 2850 fps. High accuracy demand but fixed distance, don't know about 108 ELDM performance if any.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 3098973, member: 115658"] The OP made no mention of how he will use the 6mm CM. The 6mm CM is one of my favorite rounds. I shoot about 3500 rounds per year & primer availability is a consideration, & SRP's are an easy buy at LGS and I use them in the 6mm CM, no problems with extruded powders. I like to shoot rodents, small targets, at various ranges. I am working on 80 grain H ELDMVT (low FF & thin jackets) loads for the 6mm CM and have had no problems with bullet blow ups yet @ 3400 fps, 8 twist, fair accuracy, real flat trajectories . I got over 3,600 fps with a 6mm AI, 10 twist, no blow ups but poor accuracy, despite Miller Sg estimates of adequate plastic tip stability, this also occurred in other rifles. The Miller Sg estimation works good with many bullets, except the new ELDMVT's that have large empty voids under the plastic tip. The Miller analysis has doubts about fine accuracy when Sg values are over 2.0. I would not want to buy 1,000 or so bullets that proved to be inadequate for my use so I pay attention to Miller. I like to buy bullets in 500 lots but only after shooting 100 & doing some simple stat work. Fast twist rates & high velocity magnify any bullet imbalance/defect & result in a sad buyer's remorse (waste) should money be spent on 1,000 bullets. I look at an Sg value that will assure best performance with an intended bullet at all conditions. Occasionally, I get to buy bullets that were rejected for various reasons including accuracy problems, like improper twist rate for bullet. My favorite & cheap 6mm bullet is the 105 Barnes Match burner @ 3,000 fps, Sg in the 1.6 range, 8 twist. The smaller 6mm Dasher using 105 Berger VLD's with 7.5 twist is a frequent winner at local 1000 YD BR matches, Sg 1.64 @ most temps, elevation 3500, about 2850 fps. High accuracy demand but fixed distance, don't know about 108 ELDM performance if any. [/QUOTE]
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6mm Creedmoor barrel twist?
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