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Long Range Hunting & Shooting
Rebarreling 300saum what twist to order?
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<blockquote data-quote="osok-1k" data-source="post: 1601199" data-attributes="member: 106259"><p>If you shoot right handed, order a barrel with left twist which will torque into you as opposed to away from you. You become a buffer. The bullet doesn't care which direction it's rotating. You could also consider a gain twist barrel which increases twist rate as the bullet travels down the bore, the initial torque is reduced as applied to the bullet itself as well as the felt torque as applied to the shooter. An engineer at Bartlein told me that he shoots left / gain (T-twist) in his personal builds with excellent results.The rifle pictured here is a T-twist Bartlein starting at 9 and final is 8, it shoots .3 groups so far with more load development still to be done. It's a 6.5 barrel, if I were shooting .30 cal with heavy bullets I might consider 10 to 9 gain twist. Some of this will be affected by barrel diameter / profile as more bullet weight in a specific twist will apply more rotational force although I believe that most of that initial torque is applied in the first few inches as the bullet moves down the bore. With all of the excellent information already posted and considering your already stated parameters for bullet weight, a good 1-10 barrel will serve you just fine.</p></blockquote><p></p>
[QUOTE="osok-1k, post: 1601199, member: 106259"] If you shoot right handed, order a barrel with left twist which will torque into you as opposed to away from you. You become a buffer. The bullet doesn't care which direction it's rotating. You could also consider a gain twist barrel which increases twist rate as the bullet travels down the bore, the initial torque is reduced as applied to the bullet itself as well as the felt torque as applied to the shooter. An engineer at Bartlein told me that he shoots left / gain (T-twist) in his personal builds with excellent results.The rifle pictured here is a T-twist Bartlein starting at 9 and final is 8, it shoots .3 groups so far with more load development still to be done. It's a 6.5 barrel, if I were shooting .30 cal with heavy bullets I might consider 10 to 9 gain twist. Some of this will be affected by barrel diameter / profile as more bullet weight in a specific twist will apply more rotational force although I believe that most of that initial torque is applied in the first few inches as the bullet moves down the bore. With all of the excellent information already posted and considering your already stated parameters for bullet weight, a good 1-10 barrel will serve you just fine. [/QUOTE]
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Rebarreling 300saum what twist to order?
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