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Thread: New .22-250 barrell, what twist rate?

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    New .22-250 barrell, what twist rate?

    I'm taking my 77 mkII to ER Shaws tomarro. It's a sporter with a light barrell, 1-14 twist. I talked to Chris at Shaws about a 1-9 twist barrell to shoot 55gr Sierra BK's. He tried to steer me towards a 1-12. Sierra told me the 55 bk would stabilize fine in that twist. Any thoughts?
    Molon Labe!

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    Unless you plan to shoot really heavy bullets like 69-77's, you don't need more than 1-12 to stabilize any 55 grain bullet on the market in a 22-250. Using a lot more twist than you need can be hard on the bullets and also on the barrel. I think the Shaw people know their barrels and would be likely to take his suggestion.

    On the other hand, if you DO plan to try the ultra long heavy low drag projectiles, you won't be happy unless you have at least the 1-10. Remember that the 22-250 creates a lot more velocity than the lesser 223 so will need less twist rate per grain. Lots of fast twist barrels will shoot the lighter bullets well, but you'll probably wear it out sooner than the slower twist one. Use the least twist you need to stabilize would be my guess.

    Oh, if you do get the fast twist ones, you know you'll probably not be able to shoot the lightest bullets (45grain) as they will likely come apart with full power loads. If you download, they'll stay together but that kind of defeats the whole purpose, doesn't it?

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    Thanks Bob, I talked to Sierra's Bullet tech because there was an article in Handloader on the 22-250 and it stated that some 1-12's didn't stabilize bk's enough. On the phone Sierra stated that overstbilization wasn't a problem. The rifle is my woodchuck/coyote rifle. 55grs is the light end of the spectrum for me. Remmys new predator rifle is a 1-9.75 twist rate. This couldn't be too wrong could it? Not trying to start an arguement, just looking for the best set up. Thanks.
    Molon Labe!

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    Twist rates are probably the toughest choice when building up a rifle and the smaller the caliber the tougher the choice can be. In 22 calibers you need to decide on a very small range of bullet weights, 52-55 grains, 68-69 grains, whatever...and rifle for that weight. Once you have done so you just have to live with that choice if you want top accuracy. I would say pick a bullet weight and talk with your barrel maker and go with his advice. When I had my Cheetah barreled I wanted to stick with 55 grain and it was suggested I go with 1-14...I did so and it resulted in a 1/4 MOA rifle. One other factor in a high speed cartridge is the slower twist rates place less stress on the bullet itself, even with the slow twist I used I still occasionally blow up standard copper jacketed bullets. Only reliable JHP I have found is the Ballistic Tip, tho I have changed over to the 53gr Barnes X-Bullet for the most part, as a monolithic it has greater strength, haven't blown one up yet despite pushing them at 4200fps.
    But when a long train of abuses and usurpations, pursuing invariably the same object evinces a design to reduce them under absolute despotism, it is their right, it is their duty, to throw off such government, and to provide new guards for their future security. - The Declaration of Independance

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    What is the primary use - I would look at a 1-10 rate as a compromise. I have 1:14 and 1:12's and they will not shoot the heavier bullets. I hardly ever shoot them anymore as I can use a 204 Ruger or 223 Rem to shoot light bullets at reasonably fast velocities.

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    Thanks

    Thanks Guys, I went with a 24" 2.5 contour straight flute in 1-12. Playing it safe. It won't be done for 24 weeks. Now I need a "stand in" small caliber rifle. Maybe a Rem predator. Wonder what the wife will think!
    Molon Labe!

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    I am sure it will be just fine. The 14 twist was industry standard for .22 centerfires and 50-55 grain flatbase spitzers for a number of decades before the Army messed it all up. People now think that good for nothing but 40-45 grains.
    A 12 twist will let you shoot 60 grain bullets with confidence.
    My old 77V 14 twist will shoot SOME 60 grain bullets but not others. The Hornady 60 gr SP is fine, the slightly longer 60 gr HP is just wild.
    I have a few facts and a lot of opinions.

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    I have heavy barrel and thight chamber 12"twist rebarreled 98 Mauser . It is very accurate with 40-70 gr bullets.

    PS: bergara.barrels.com/faq.html

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    My limited experience

    Remington 700 VLS in .22-250. Stock barrel with 1/14 twist.
    Shoots 50 and 55 grain bullets with ease. Best groups at just under .400 inches.

    Will not group 69 grain HPBT Sierra bullets in less than half an acre. 70 grain RNSP Hornadys work pretty well. Not excited, but good enough for small game down to coyotes or so.

    I would have preferred a 1/12 or faster. But I tend toward heavier bullets.

    Recoil Rob sounds like he knows about it. However, I didn't know faster twist barrels wear out faster than slower twist barrels. Realistically, how many shooters shoot enough to wear out a rifle barrel?

    And I will again say, a lot of overspin is preferable to a little underspin.
    My opinion; guaranteed worth twice what you paid for it.
    Archie
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    Archie,
    One way you can picture it is to compare a 1-7 to your 1-14. At the same 3500fps velocity, it will increase the bullets rpm from 180,000 to 360,000. Use the same load in both barrels and the faster twist one would be expected to show higher pressures due to the increased resistance needed to double the projectile rotation, and a bit more powder needed to reach the same velocity. But, each barrel could reverse this because of finish and sizing so it is just a generalization.

    Also, picture the bullet after passing through each barrel. Measure the linear rifling contact on the bullet and the slow twist will have much less. An extreme for visualization would be a 1-100 vs 100-1 where the first has grooves with no appreciable twist down the bullet where the other looks like an ultra-fine thread screw. Which has more friction?

    The generalization that the faster twist wears out faster is because of the increased friction caused by it. Of course, all barrels are not equal and there could be exceptions, but I believe the trend is true.

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