cjl2010
Well-Known Member
Looking at a proof barrel for a 7ss build. Would an 8.44 twist barrel be too fast for 168-180 bergers? Thanks
Twist Rate
- Thread starter cjl2010
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MudRunner2005
Well-Known Member
Personally, I'd go 1:8 that way you'll have more than enough twist to handle the Berger 195 Elite Hunters, or any other bullets you choose to shoot.
cjl2010
Well-Known Member
Any concerns of pressuring early on the 180s?
elkaholic
Well-Known Member
That twist would work fine for even the 195's at 2000' and above. If you were shooting only 195's, I would go with the 8......Rich
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MudRunner2005
Well-Known Member
There's a lot of factors that play into that, but I don't think I'd worry too much about an extra 1/2 inch of twist. Just personal opinion, others' opinions might be different.
cjl2010
Well-Known Member
Perfect. Pulled the trigger on a 24" 1:8.44 twist sendero light barrel. I live at 5000 ft and hunt from 2500-7000 ft so hope I won't have any issues. 1 component closer to my 7ss build. FYI I used the coupon code at evolved ballistics for -$100 and free shipping.
Code-EB100CF
Code-EB100CF
I think it was in a 7mm-08 thread but you commented on twist rates and RPM gaines at distance. Which opened my eyes to how detailed and tailored this all can get.
What is the true purpose/advantage of a progressive twist barrel ?
elkaholic
Well-Known Member
Less initial pressure and insures that bullet is not LOSING rpm if the barrel is not true! Jury is out however?
elkaholic
Well-Known Member
Potential for more velocity
MudRunner2005
Well-Known Member
Progressive twists are designed to help alleviate initial pressure spikes and increase velocity, by giving you lower pressures at the initial bullet travel with a slower twist. Then as the pressures build as the bullet is traveling, increasing the bullet's velocity, the twist rate also starts tightening up, increasing the bullet's RPM's in the bore, and as the bullet exits the muzzle it is now spinning fast enough to be stabilized.
I think it's a really cool concept, based on scientific principles, but I've never shot or owned one, so I cannot confirm or deny how well they work.
Rich Coyle
Well-Known Member
tag
elkaholic
Well-Known Member
Down side is the more gain, the more bullet distortion from the lands!
so if i wanted to end up with an end twist rate of 9:01, and started with (just guessing) a 6.5:01, the lands would put more drag on the bullets ?
