Best bullet weight for 16" 1 in 9 twist and reload data.

Discussion in 'AR-15 Discussion' started by cfraga1978, Dec 21, 2011.

  1. cfraga1978

    cfraga1978 New Member

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    I am just looking for a good load for my 16" 1 in 9 twist. I was looking in my book at 62gr data but there didn't seem to be much powder options. Have any of you shot 69gr in a 1 in 9? I was thinking about 55gr with reloader-15 but would love to have a little more mass to carry it to the longer ranges. What has worked for you guys that reload?

    High angle hell. Death and destruction from above.
     
  2. FCross7

    FCross7 New Member

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    69 is probably a little heavy for a 1 in 9. I'd stick with either 55 or 62. I've hard good results with Varget. 25.5 grs if I remember correctly, behind a 55 gr FMJBT in 1 in 9 twist barrels.

    -Fred
     

  3. Quentin

    Quentin New Member

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    I agree with Fred and usually use 52-62 gr. in my ArmaLite 16" 1:9. 55-62 is a good rule of thumb, but give 69 a try, each barrel is different and some are actually 1:8.5, not 1:9. You never know till you try it out and see what loads are most accurate in your rifle.
     
  4. cfraga1978

    cfraga1978 New Member

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    Thanks for the replies guys.

    Do any of you guys have any tried and true reload data worked up for 55gr. Or 62gr? I have my load data book but I know others have been working up their loads for some time. I would like some proven powder & bullet combos before I go buy some.

    Thanks

    High angle hell. Death and destruction from above.
     
  5. Quentin

    Quentin New Member

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    Sorry, I don't reload .223.
     
  6. mjkeat

    mjkeat New Member

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    Hornaday makes some 69gr designed for 1:9
     
  7. lonyaeger

    lonyaeger Active Member

    no offense, Fred, but "if I remember correctly" is probably not really good advice to give to someone on the Internet asking about powder charges! Just sayin'.....
     
  8. cfraga1978

    cfraga1978 New Member

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    Don't worry, I know enough about reloading to just load a round without knowing what type of powder or without checking the charge book for max safe charge. ... just saying..

    There is a min and a max charge for every load and some guys spend lots of time finding the sweet spot. That's what I am looking for someones sweet spot load.

    High angle hell. Death and destruction from above.
     
  9. Mossyoakman3006

    Mossyoakman3006 New Member

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    Mine likes 60 partitions with 24 grs. of varget pushing it.
     
  10. FCross7

    FCross7 New Member

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    Good point, and point well taken. In the future I'll either look it up to be sure, or not post it at all. Don't wanna go blowing anyone up. :D

    -Fred
     
  11. Sniper03

    Sniper03 Supporting Member Supporter

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    1978,

    The 1:9 twist will shoot from 55 gr -69gr. bullets fair! But the 69gr.-72gr. is on the high side of good stability in flight for the 1:9 twist rate. This due to the fact when you get up to the 72 + grain bullet range actually you need to go to a faster twist like 1:7 to stabilize them effectively for max accuracy. Although the 1:9 twist will shoot the 55 gr. bullets very well, most will find that around the 62 gr. bullet weight you have mention seems to produce max accuracy in the 1:9. And if you are reloading, powder volume in the mid range is usually best for peak accuracy. But I will remind you, that every rifle has it's own personality if you please and there will always be a rifle that is an exception to the rule. I have a friend that has a Rock River A-4 20" Varmint Rifle in 1:8 twist. Would logically we think that it would be a tac driver with 42 or 45? grain specialty varmint bullets? NOT! But it does and is a tac driver. Should it/ NO! :rolleyes:

    03
     
  12. SSGSF

    SSGSF New Member

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    Here you go this should help you



    Twist Rates
    The .223 Rem shoots a wide range of bullets very effectively, from 35gr flat-based varmint bullets, to ultra-long 90gr VLDs. However, you'll need the right twist rate for your choice of bullet. For max velocity and accuracy with the lightest bullets, a 1:14" twist may be ideal. More versatile is a 1:12" twist that will allow you to shoot the popular 60-64 grain match bullets. (However, a 1:9" twist is needed for the steel-core 62gr bullet used in the M855 military loads, because that bullet is as long as most 70-grainers.) For normal lead-core jacketed bullets, a 1:9" twist will let you shoot up to 73gr bullets. Since most .223 Rem shooters prefer bullets in the 50-73gr range, a good "do-it-all" solution is a 9-twist, unless you're a Highpower competitor.

    For long-range match purposes, long, high-BC bullets are favored for their ability to buck the wind. You'll want at least a 1:8" twist to shoot the 77gr and 80gr MatchKings and 80gr Bergers. To shoot the new 90gr pills, a 1:6.5" is recommended, though a true 1:7" will work in most conditions.

    Overall, what twist rate is best? For varminting we like a 12-twist. The slower twist will give you a bit more velocity, and minimize the risk of jacket failure at high rpms. For general use, an 8-twist barrel will let you shoot the excellent 77gr and 80gr Sierra MatchKings and nearly all varieties of non-tracer milsurp ammo. We'd only select a 1:7" or faster twist barrel if we had a need to shoot the 90gr VLDs.
     
  13. JTJ

    JTJ Well-Known Member Supporter

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    My 1:12 bolt shoots the 45 grn 1/2 MOA if I do my part. 1:8 is more for 65+ grn. I mostly load 55 grn so I can shoot them in my bolt and 1:9 AR. I use Varget but have also used H335 with good results.
     
  14. cfraga1978

    cfraga1978 New Member

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    Thanks for all the advice everyone. I think I am going to start with some 55gr I think I have some Varget and some h335 laying around. I will try some test batches increasing by .5gr up to the max load and see what kind of groups I get. I may try some 62gr and 69gr later on.