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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Question about twist rates & bullets
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<blockquote data-quote="eshorebwhntr" data-source="post: 1336287" data-attributes="member: 17112"><p>I've posted this several places recently but I guess it applies here too.</p><p></p><p>In recent years bullet manufacturers have realized that Ballistic Coefficient (BC) is related to twist rate. You likely have an older box of 230's before they were updated. In most cases there is an optimal twist to maximize BC and a minimum twist required to be stable. I agree with Mikecr...I don't believe what you're seeing is twist or bullet related. Your bullet is likely stable but a few % lower than the advertised BC.</p><p></p><p>A friend I reload for has a factory Remington 300 RUM 10 twist and we got it shooting a very good group this spring with the 215 Hybrid. He shot it most of the summer and noticed the accuracy was degrading and called me in a panic thinking the throat was burnt out. I measured it and it had eroded .024 in 250 shots or so. He hadn't cleaned the rifle so I started there.</p><p></p><p>Patches were dark dark blue. Let it soak overnight and get all the fouling out. The next day it was right back to sub .5 moa without any changes to anything else. Not saying this is your problem but it might be a place to start.</p></blockquote><p></p>
[QUOTE="eshorebwhntr, post: 1336287, member: 17112"] I've posted this several places recently but I guess it applies here too. In recent years bullet manufacturers have realized that Ballistic Coefficient (BC) is related to twist rate. You likely have an older box of 230's before they were updated. In most cases there is an optimal twist to maximize BC and a minimum twist required to be stable. I agree with Mikecr...I don't believe what you're seeing is twist or bullet related. Your bullet is likely stable but a few % lower than the advertised BC. A friend I reload for has a factory Remington 300 RUM 10 twist and we got it shooting a very good group this spring with the 215 Hybrid. He shot it most of the summer and noticed the accuracy was degrading and called me in a panic thinking the throat was burnt out. I measured it and it had eroded .024 in 250 shots or so. He hadn't cleaned the rifle so I started there. Patches were dark dark blue. Let it soak overnight and get all the fouling out. The next day it was right back to sub .5 moa without any changes to anything else. Not saying this is your problem but it might be a place to start. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Question about twist rates & bullets
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