enough twist?


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Old 12-04-2009, 03:38 PM   #1
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Default enough twist?

i finally got my savage back from savage: they ended up replacing the barrel and sending it back free od charge. It a model 12 bvss .223 1-9 twist 26 inch barrel. I got ahold of a box of berger vld 75 gr hpbt and im wondering if the 26 inch barrel in 1-9 twist will be enough twist to stabilize that long heavy bullet? it shoots the 70 gr bergers just fine .3-.5 moa over 25 gr of varget at 100 yards.

Im also having a problem with getting consistent seating depths on compressed loads. I get my RCBS micrometer seater set with a dummy round to the depth i want but when i try to seat a bullet with the same setting over a compressed load it wont seat to the same depth. Is this a common problem?



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Old 12-05-2009, 04:16 AM   #2
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Most references say 1/7 or maybe 1/8 for a 77 gr. It really depends on the length. A VLD is a long bullet so I venture 1/9 is not likely to stabilize well. Consistant seating is not possible in highly compressed loads unless you neck turn and get lucky a bit.



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Old 12-05-2009, 12:16 PM   #3
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Berger says 70 and 73gr VLD are ok for your twist but for the 75gr you need an 8 twist.

http://www.bergerbullets.com/Products/Target%20Bullets.html

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Old 12-23-2009, 12:52 PM   #4
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Default Twistrate "calculator".

Here You are: Twist Rate, Bullet Length and Velocity calculations


Also, Happy Christmas and New Year !

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