Stock up ammo 5.56

Discussion in 'AR-15 Discussion' started by tenntyrant, Apr 21, 2012.

  1. tenntyrant

    tenntyrant New Member

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    WHat would be a good bullet weight to have stocked up in case you ever need it for rifles with a 1:7 and a 1:9 twist 5.56 223 one round that will shoot good in both. I'm thinking 69 grain what's your thoughts?
     
  2. BenLuby

    BenLuby New Member

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    You looking for a midrange grain that works well in both, or separate? I think I'd opt for one that works well in both calibers, because you're not talking a major variance in twist rate. The 1:7 is obviously faster, but somewhere in the 60 category would work well.
     

  3. Jpyle

    Jpyle New Member

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    55gr or 62gr will work equally well and should be abundant in bulk at reasonable prices...at least for now.
     
  4. Quentin

    Quentin New Member

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    I agree, 55-62gr should be optimal for most 1:7 and 1:9 ARs. And reasonably priced.
     
  5. Duck4Glocks

    Duck4Glocks New Member

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    What about a 1:8 twist?
     
  6. Jpyle

    Jpyle New Member

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    No difference. For all practical purposes, 1:7, 1:8 and 1:9 will all perform more or less the same with 55-62gr ammo. Unless you are shooting extreme distance with longer, i.e. heavier loads or heavy tracer rounds, there is nothing gained between a 1:7 and a 1:9. Lighter, varmint rounds in the 40gr or so range may need a 1:9 or 1:12 to prevent overspin.
     
    Last edited: Apr 22, 2012
  7. Shade

    Shade New Member

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  8. nickel1911

    nickel1911 New Member

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    What a great link! Thanks for posting
     
  9. purehavoc

    purehavoc New Member

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    Your going to have to shoot both 55 and 62 gr and see how they shoot out of your guns , both of mine will shoot 55 but one of them is not as accurate with it and both barrels are 1:7 both by the same manufacturer , they both shoot 62 about the same and much better than the 55 gr . just buy a couple boxes of each and try them out yourself .
     
  10. BenLuby

    BenLuby New Member

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    If both your barrels are chrome lined, that could have something to do with it, as chrome doesn't make a perfect bond, and thus, each barrel will be different. Thus, shooting a lighter 55 grain will give different results than shooting the heavier 62 grain bullet. Another thing would be what ranges do the differences become quite apparent?
     
  11. purehavoc

    purehavoc New Member

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    Both Chrome lined and one shoots 1-1.5" @ 100 with 55 gr the other 3"@ 100 with 55 gr both shoot 1" @ 100 with 62 gr .
     
  12. tenntyrant

    tenntyrant New Member

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    One of mine is a RRA tactical operator 2 1:9 twist and the other is a LRC m6a2 1:7 twist will 62 grain shoot well in both?

    image-1733923924.jpg
     
  13. canebrake

    canebrake New Member

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    Sounds like its 62gr! ;)
     
  14. purehavoc

    purehavoc New Member

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    Good call . LOL You really just need to shot a couple different weights and manufacturers ammo and see what shoots best outta ur gun . Just because it shoots good outta mine doesnt mean it will do as well in another rifle . I have a pretty good feeling that my 2 barrels came off 2 complete different lathes , Lots of different variables like sharper / duller bits etc .