is a 1:7 twist too powerful for a 55grain round?

This is a discussion on is a 1:7 twist too powerful for a 55grain round? within the Defensive Rifles & Shotgun Discussion forums, part of the Related Topics category; In a Colt M4 with the 1:7 16" barrel, my experience has been superior accuracy with the 62 gr. The tumble is clearly noticed on ...

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Thread: is a 1:7 twist too powerful for a 55grain round?

  1. #16
    Senior Member Array DocT65's Avatar
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    In a Colt M4 with the 1:7 16" barrel, my experience has been superior accuracy with the 62 gr. The tumble is clearly noticed on paper when using the 55 gr. That said, at 50 yds the 55 gr will deliver an OK grouping, but nothing like the groups with 62 gr, which can easily be 2-3".
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  3. #17
    Ex Member Array AdBro's Avatar
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    by tumble do you mean the 55gr is yawing? that would be really bad.

    have you shot 50gr out of it? i wanna know if i can use this case of HPs i got

  4. #18
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    I have all 1:7 twist barrels on my rifles. It is the best for me because I like the option of using 75gr ammo if things get serious. For plinking/practice, 55gr M193 has been great for me. I would think that the thinner cased varmint type bullets would be more likely to "come from together" at the muzzle if the twist is too much for them. Also - some yaw at close ranges isn't necessarily the end of the world - the bullet is spinning, and will stabilize further out. It isn't ideal though. Lots of good info over on ar15.com on this - I think a guy who goes by Molon did a lot of research in this area.

    Austin

  5. #19
    Ex Member Array AdBro's Avatar
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    so accuracy shouldn't be a problem with M193 at ANY distance??

  6. #20
    Member Array Coltman 77's Avatar
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    Quote Originally Posted by AdBro View Post
    so accuracy shouldn't be a problem with M193 at ANY distance??
    I'll let the historians here answer that question. And I apologize for not knowing the first 1963 Colts had a 1 in 12 twist.

    I was more concerned with letting you know that a 1 in 7 twist currently manufactured Colt will handle any 5.56/.223 ammo. Good luck.
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  7. #21
    VIP Member Array Smitty901's Avatar
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    Except for one that is 1 in 8 all of mine are 1 in 7. I shoot .223 55 and 5.56 62 in them just fine the zero is a little different but it your in a pinch not enough to miss center mass

  8. #22
    VIP Member Array glockman10mm's Avatar
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    One thing to mention, is if the bullet is constructed of solid copper, such as the Barnes, then the 50 grain bullet may be quite a bit longer than the conventional lead bullet of the same weight.

    Sometimes with this type of bullet and longer bearing surface, a faster twist is desired.
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  9. #23
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  10. #24
    VIP Member Array aus71383's Avatar
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    Looks overpriced - but maybe I'm out of touch because of the election.

    This is cheaper Winchester 5.56x45 (.223) M855 62grn Green Tip 20rd Box

    ...and usually M855 goes for more - I guess people like that it is military issue, or maybe the "steel penetrator" or something.

    Here's some 55 gr soft point for cheaper: Widener's Reloading and Shooting Supply INC

    and here's some M193 for also cheaper: Widener's Reloading and Shooting Supply INC

    Did you already buy the ammo? There's nothing wrong with 50 gr JHP - I'd have no problem shooting it out of my rifles. As for the accuracy - find out on the range if you already own it, otherwise read up on the existing info available online.

    Austin

  11. #25
    Ex Member Array AdBro's Avatar
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    I got a bulk case of it. It wasn't the price that I posted.

    Ihave m855 and m193 too. I'm just wondering if the 50gr can handle the 1:7 okay.

  12. #26
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    do you use wideners for ammo purchasing a lot? their prices seem good!

  13. #27
    Ex Member Array pscipio03's Avatar
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    I read somewhere that the lighter than 55gr tend to make the bullet yaw a lot when leaving the barrel in a 1:7. My understanding is that it is caused by the tail of the bullet somehow wanting to move faster than the tip. I am no ballistician, so please don't take that as gospel. It said the boattail design will alleviate that, so at greater distances you'll have tighter groupings.
    Wish I could find that-- was in one of my reloading handbooks...

  14. #28
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    It says here that m193 (55grain) is just fine in 1:7. I'm sure the boat tail helps that.

    The AR15.com Ammo Oracle

  15. #29
    VIP Member Array ccw9mm's Avatar
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    Here is some good info about the cartridge: .223 Ammo @ 6mmbr.com.
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