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22-250 rebarrel - twist rate?

Discussion in 'Gunsmithing and Repairs' started by rbernie, Jun 15, 2011.

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  1. rbernie
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    rbernie Member

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    I have a 22-250 that I am debating having rebarreled to shoot 65gr-75gr bullets. Has anyone done this, and what twist rate is needed to stabilize these heavier bullets in a 22-250? I figure than a 1:9" twist would be ideal, but would prefer not to spend the cash without having some clue as to the likelihood of success. ;)
     
  2. joed

    joed Member

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    I want to know how long barrel life is with a fast twist like that. I've heard horror stories of 600 rounds for a .22-250, and I just laugh.
     
  3. ironhead7544

    ironhead7544 Member

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    Im guessing you want to use it at long range. The 75 gr BT would need a 1 in 8 IMHO. A 1 in 7 would be better. I would ask the barrel maker what he recommends. Do a search and you will find some info on 22-250 heavy bullet rifles.
     
  4. Cemetery21

    Cemetery21 Member

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    I don't have advice on the twist rate - there are others with experience on that.
    But if you are a fairly high volume shooter, you might consider using a long blank and leaving the outer profile straight for several inches out from the chamber. That way, you can set the barrel back and rechamber when you get throat erosion. I got 3 lives out of the same 22-250 barrel that way, on light bullets.
     
  5. dirtyjim

    dirtyjim Member

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    i would go 1-8 myself because it will stabilize the 75's while the 1-9 most likely will but i've seen a few that wouldn't.
    leaving the shank long is also a good idea so after about 1500 rounds you can set it back for a new throat.
     
  6. 243winxb

    243winxb Member

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    Its the length, not the weight as i am sure you know.

    Sierra lists the twist for some of there bullet if you click on the bullet number.
    Berger lists the perfect twist for all there bulllets last time i looked.:)
     
  7. Jim Watson

    Jim Watson Member

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    Berger says an 8 twist would get you up to an 80 gr VLD or 82 gr BT.
    That might be the sweet spot for a heavy bullet .22-250.

    I've got a 6.5 twist 90 gr .223 that may be too much of a good thing.
     
  8. rbernie
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    rbernie Member

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    Indeed, but always good to reiterate. :)

    The reason that I ask is that most of the barrel twist recommendations for heavier .224 bullets are geared around slower 223 applications and not the faster 220 Swift or 22-250 or 225.

    Most 22-250s are set up with 1:14" twists that stabilize the 55gr-60gr just fine, so I'm figuring that the 22-250 runs 2" slower per inch for a given bullet weight than would a 223.
     
  9. 243winxb

    243winxb Member

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    . Yes, makes a difference. Years ago i run into a guy shooting a Hart barrel in 224/6mm Rem wildcat. The twist was 1-10 using 55 to 65 or 69 gr Sierras. I remember 1 load was right at 4000fps over the chronograph, but showing pressure signs. Groups were running around 1", not great for the amount of $$ he had invested.
     
  10. NCsmitty

    NCsmitty Member

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    I would not use any twist faster than the 1in9" due to the velocity advantage of the 22-250 over the .223, causing a potential increase in friction and pressure, and the possibility of skidding the bullet in a very fast twist.
    Velocity alone can compensate for slower barrel twist, with higher rotational speed for stabilization.



    NCsmitty
     
  11. Jim Watson

    Jim Watson Member

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    Ken Waters got good accuracy with 69 gr SMK from a 10" twist .22-250

    Calculating from Sierra data, a 10.4" twist .22-250 would give the same rpm as a 9" twist .223.

    So I would say that a 9" twist .22-250 would surely handle a 75 gr bullet.
    Some but not all 9" twist .223s will, after all. A friend has one that will. It is not quite as accurate as with a 69 in calm air, but the 75 shoots closer to the wind.

    It might well get you up to an 80 gr bullet without needing the 8" twist I guessed at above.
     
  12. rbernie
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    rbernie Member

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    Super - thanks. :)
     
  13. dirtyjim

    dirtyjim Member

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    it would also depend on what you plan on using the rifle for. if its only a paper puncher go with a 1-8 or 1-9, if you plan on shooting critters with it most of the varmint bullets are in the 45-55 grain range and are meant to be driven very fast so i'd do a 1-12 or 1 -14.
     
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