9 twist 223

Discussion in 'Small Stuff--22s, 20s, and 17s' started by gman47564, Jan 3, 2020.

  1. gman47564

    gman47564

    Joined:
    Oct 7, 2019
    Messages:
    234
    Question for the 223 guru's out there.. whats the heaviest bullet i can use in a 9 twist 22 inch 223 barrel? Thanks
     
    mac86951 likes this.
  2. Handi204

    Handi204

    Joined:
    Dec 19, 2010
    Messages:
    62
    I use 69 grain in my 23" Encore and they shoot well.
     
    gman47564 likes this.
  3. Terry

    Terry Gold $$ Contributor

    Joined:
    May 4, 2009
    Messages:
    3,251
    I shoot 80 Nosler CC bullets.
     
    gman47564 likes this.
  4. stacy

    stacy 2 TIMOTHY 2 VERSE 15 Silver $$ Contributor

    Joined:
    Jan 6, 2012
    Messages:
    1,760
    MYSELF HAVE HAD GREAT RESULTS UP TOO 75GR BULLETS IN MY TACTICAL BOLT GUN WITH H-4895 AND VARGET
     
    gman47564 likes this.
  5. Topstrap

    Topstrap

    Joined:
    Jan 22, 2013
    Messages:
    211
    75s with 8208, one nice little hole at 100. Shot well to 750/800 but went crazy after that.

    Topstrap
     
    Andy Legg and gman47564 like this.
  6. Andy Legg

    Andy Legg

    Joined:
    Jan 3, 2019
    Messages:
    44
    My son(Dylan) & I both shoot 1/8 twist Barrels(Dylan's is 16" & mine is 18"). We have shot up to 77 grain SMK in those.

    My cousin was wanting to come in from out of town to shoot a 600 yard NRA Mid-Range Prone Tactical Rifle(AR) with us. We borrowed a 20" 1/9 twist rifle from my dad & I took it to a 600 yard club match the week before my cousin came down. He is just getting started in Mid-Range shooting and I wanted to make sure the rifle would do OK at 600 yards. The barrel is a 1/9 twist Anderson 20" Bull Barrel(SKU# B2-K004-A011).

    I figured from what I have heard/read on the interwebs that the 69 grain SMK's would be the hot ticket in the 1/9 twist barrel. Conditions remained fairly consistent throughout the day and I decided to test this for myself. I shot Match #1 with the 69 SMK's(196-8x), Match #2 with 77 SMK's(199-9x) and then I went back to the 69's for the final Match(195-3x). The 77's shot significantly better than the 69's!

    The 77 SMK's run about 2730 fps at 60F(BP=29.87"Hg @ just above sea level) out of the 20" Tube. Miller Stability Index=1.4 to 1.5 depending on the temperature/velocity.

    Note: The 77's were a Minute and a Half High as compared to the 69's(had to come down 6 clicks in match #2 & come back up 6 clicks in match #3).

    I would guess they would go subsonic somewhere between 700-800 yards at sea level.

    We're using LC Brass with 23.4 Grains of 8208XBR with Federal GM205M Primers at 2.260" COAL with both the 69 SMK's and the 77 SMK's.

    Hope this helps(YMMV).....Andy:)
     
    Last edited: Jan 3, 2020
    anschuter2013 and gman47564 like this.
  7. gman47564

    gman47564

    Joined:
    Oct 7, 2019
    Messages:
    234
    Thanks all.. i didnt know if it would stabilize anything heavier than a 69 or not..
     
  8. Rodney

    Rodney Silver $$ Contributor

    Joined:
    Sep 28, 2017
    Messages:
    99
    My savage axis with a 22 inch 9 twist barrel shot the 75 grain hornady BTHP bullets really well. The Berger 70 grain VLD's shot really well to. Didn't try anything heavier.
     
    Andy Legg likes this.
  9. Andy Legg

    Andy Legg

    Joined:
    Jan 3, 2019
    Messages:
    44
    Some of the stuff I read on the internet had me questioning using the 75-77's in the 1/9 twist tube....not anymore.

    Is yours an AR or a Bolt Gun? Who made the barrel?

    I think your good to go. Out to 300 I can't tell the difference in the 69's and the 77's(group size). Past 300 I'd certainly give the 75 grain Hornady's or the 77 SMK's a shot.
     
    gman47564 likes this.
  10. gman47564

    gman47564

    Joined:
    Oct 7, 2019
    Messages:
    234
    Mine is a bolt gun. Factory savage model 10 predator max 1.. bought it used today and figured it would make a good truck gun..
     
    Idaho-45 and Andy Legg like this.
  11. daleboy

    daleboy Gold $$ Contributor

    Joined:
    Mar 27, 2017
    Messages:
    1,787
    77 Sierra Tipped Match Kings , long bullet . Shoots great in a 20" 1/9 twist...H4895 and Varget both work well.
     
    Texas10, Andy Legg and gman47564 like this.
  12. std7mag

    std7mag

    Joined:
    Dec 21, 2019
    Messages:
    331
    I'm using 69gr MatchKings & Tipped MatchKings with prepped LC brass, Fed small rifle match primers and Alliant PP2000 powder in my wifes Savage 110FP. 24" heavy barrel 1:9 twist.
    20 rounds under 1 inch at 100 yards with boring regularity.
     
    gman47564 and Andy Legg like this.
  13. rsmithsr50

    rsmithsr50

    Joined:
    Oct 29, 2019
    Messages:
    967
    it becomes an issue when the bbls get short like the very common 16's.
    in a 22 just keep trying till you find what will not work'
    from a 75 horn match, I would try the 75atip..a bit longer.
     
    gman47564 likes this.
  14. Ned Ludd

    Ned Ludd Gold $$ Contributor

    Joined:
    May 28, 2012
    Messages:
    3,567
    Stability of a given caliber bullet is generally determined by its length, not its weight, although bullet linear velocity also has an impact on its spin rate from a given twist barrel (i.e. faster velocity = faster spin rate in RPM = greater gyroscopic stability). The effect of velocity is typically small; a significant increase in velocity is necessary to overcome an insufficient twist rate.

    For a given bullet weight, the shorter it is, the slower the twist rate you can get away with. I have shot 77 SMKs in factory ammunition out of a 10-twist .224" barrel and they worked just fine. I have also heard of instances where a 9-twist [factory rifle] barrel was apparently insufficient for the 77 SMK. Likewise, Hornady's 75 gr BTHP will sometimes work in a 9-twist barrel, sometimes that combination appears to be on the edge of gyroscopic stability.

    When running close to the margin of whether a given twist rate may effectively stabilize a certain weight (length) bullet, sometimes the only way to know for sure is to shoot a few and determine empirically whether they exhibit stability issues. If a bullet exhibits slightly oval or oblong holes in the target, or even key-holing, the twist rate is clearly not sufficient.
     
    gman47564 likes this.
  15. Rustytigwire

    Rustytigwire Gold $$ Contributor

    Joined:
    Mar 20, 2017
    Messages:
    573
    I bet it shoots fine, run it!
    Surely it shoots better than me!
     
    gman47564 likes this.
  16. Rick300

    Rick300 Silver $$ Contributor

    Joined:
    Nov 28, 2016
    Messages:
    185
    My exact experience also
     
  17. USMCDOC

    USMCDOC

    Joined:
    Sep 2, 2016
    Messages:
    2,971
    73 gr LTB's from Berger..
     
    thekriebles likes this.
  18. USMCDOC

    USMCDOC

    Joined:
    Sep 2, 2016
    Messages:
    2,971
    might have worked in yours, don't mean it will work in all.. just sayin'
     
  19. ballisticxlr

    ballisticxlr

    Joined:
    Sep 24, 2018
    Messages:
    241
    Shot 70 Berger VLD, Hornady 75 BTHP and Hornady 73 & 75 ELD's from a 9 twist in matches. It did not like anything under 70gr and wanted everything I fed it pushed hard. You lose a little BC on the 75gr class bullets but it's not enough to really matter.
     
    gman47564 likes this.
  20. gman47564

    gman47564

    Joined:
    Oct 7, 2019
    Messages:
    234
    Thanks for the input.. i have a bunch of 69 gr. Smk's and tmk's on hand.. but will give one of the 70 class bullets a try sometime..
     

Share This Page