#1
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twist and bullets
I have noticed over the years that having a fast twist doesn't always mean your rifle is going to shoot heavy bullets better than light bullets. usually it is just the opposite. there are no hard and fast rules when it comes to twist rate except to slow will results in instability, key holes and the like.
having had several 17, 223's and 6mm with quick twist barrels I have found most shoot the 40 gr bullets in 223 better than the heavy bullets. same was true with the 6mm and 60 gr sierras or 55 nosler and the same with 15 and 18 gr in 17 caliber in 9 twist . my ar-15's (plural) in 1-8 twist shot bug holes with factory Fiocchi 40 gr v-max bullets anyone else found this to be true? or were my rifles the exception to the rule?
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#2
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Rule BREAKER !!!! same here 300 BO 1-7 110-130 pills out shoot the heavier pills, find the same results with other fast twist barrels too. Light bullets seem to need to be pushed fast for the cartridge, have been my findings with the faster twist barrels
Last edited by SEM; 05-24-2018 at 02:06 PM. |
#3
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I think a lot of it falls to bullet design (length) as much as twist. Speed can over come some twist issues.
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#4
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Twist and bullets
I usually get as good or better accuracy with the lighter bullets also, especially out to around 400 yards. Now when the range starts getting further than the heavier/longer bullets start doing a better job.
So it really comes down to the distance you are shooting at, in my humble opinion. I am not into the long range shooting, like the trend is going, so I find the mid range area of twist, say 1/12 to around 1/10 works just fine. Most of my 20's,however work very well with the 1/11. Again just my opinion. Bill K |
#5
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Been Trying
I have been reading a lot about this because I am trying make sure of good performance out of the lead free bullets. Brian Litz has done a lot of work for long range on the same topic, his finding is that you can't overstabilize a bullet, The gotcha seem to be how well the bullet is constructed, you do have to watch the RPMs the bullet will take and less well made bullets may open up the groups. Expecting to test 20 cal 24gr NTX from an 8.5 twist vs 11 twist later this summer. according to the calculations 8.5 is supposed to be fully stable in all of the conditions I shoot and the increased RPMs should be hard on squirrels
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#6
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Good bullets don't care what the twist is.
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#7
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aside from blow ups (to much speed/twist which I haven't experienced yet) I find the fast twists to be more versatile. They shoot the lightweights just as good or better like you mentioned and also have the ability to spin up the heavies. not to mention recent testing (even hornady lists this on some of their BC #'s) a faster spun bullet can have higher BC performance than a marginally spun bullet.
I have just recently started shooting longer and longer distances for load workups based on some reviews that the vld's can take more time to "go to sleep" so for example i'll shoot at 100yds to find my nodes then when working up the load (if the wind is calm mind you) I setup targets at 200-300 yds to do the final workup. but to be honest I'm finding that I don't even "chase the groups" much anymore anyways. If I find something that's .5-.75moa or better but has single digit es/sd's then i'll pick that over a .3-.5moa load with higher es/sd. reason being is the load is good enough on the short shots but that tighter es/sd really starts to show up on the big end. But then again I don't care to shoot paper much any more. I'm either shooting soft targets or steel and a hit is a hit. |
#8
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I've experienced the same phenomena.... lights always easier to tune than heavies in fast twists. One Shilen 9T in a 22_250 refused to shoot 60 VM's but piled 40 VM's on top of one another. However it blew up factory 45's after about 10-15 rounds. I had to pull them and replace with 40VM's.
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Rick M. |
#9
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I've never got into fast twists.
The only times I've found bullet problems was 35gr V/M's. One holers at 100, over 200, they scattered all over the hillside. Believe that was a 1/12 Factory Sako 222mag. When that was rebarreled with a 1/14. Two of us came up with 19 different bullets from 40-55gr. The worst went 1 1/2", what surprised me was 40 & 55gr Noslers both were only making 1 1/4". With 35 & 40gr V'max, several back up targets to prove it with. TEN shots in .230". 55gr C/L's that I had over 5000 of on hand at the time were just under half inch. Those were the cheapest I had found so I got a bunch of 'em. They'll hold it well out to so far I should have my butt kicked for shooting p/dogs that far. Never had a range finder those days, since the one I did buy was stolen I still don't. Couple of us were convinced it was over 600yards two different times. That's really stretching things with a .223 regardless of bullet used. I'd already found a good load I was happy with and stuck with it thru all the testing: 25.0gr 4895. Don't recall ever punching paper, but, did go thru 3 jugs of AA2200. They shot fine too.
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George "Gun Control is NOT about guns, it's about CONTROL!!" Last edited by georgeld; 05-24-2018 at 10:15 PM. |
#10
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Factory 9 twist CZ 17 Rem tumbled 30 gr golds. Burgers shot good. Go figure.
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Shoot First... Ask questions later... On Saubier.com __________________ NRA Lifetime Endowment Member |
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