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AR-15 with 1/12 twist barrel

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  #1  
Unread 09-04-2011, 05:43 PM
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AR-15 with 1/12 twist barrel

I am looking for info on what bullet weight and powder to use with the 1/12 twist barrel. I have read that the XM193 military ammo was what should be used. I just got this rifle and wanted to find out whats best. All information is greatly appreciated. I am thinking H335 and a 55gn bullet.
Thanks
Dave
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  •   #2  
    Unread 09-05-2011, 09:15 AM
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    Re: AR-15 with 1/12 twist barrel

    Any 40 gr up to 63 gr should work. It should shoot very well with a 50 or 55 Vmax. 335 or 748 powder should provide good results.
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      #3  
    Unread 09-05-2011, 09:38 AM
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    Re: AR-15 with 1/12 twist barrel

    I have loaded up to 64gr Winchester Power Points with a single shot Rossi. It had a 1:12. I used 25 grains of H335 to get about a 1 1/2 inch group. Hope this helps.
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      #4  
    Unread 09-05-2011, 10:21 AM
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    Re: AR-15 with 1/12 twist barrel

    Thanks very much. Does anyone know why the 5.56 xm855 would not work? I read that the military manual says not to use except in emergency combat situations. To use the xm193. Just curious as to why.
    Thanks
    Dave
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      #5  
    Unread 09-06-2011, 02:42 PM
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    Re: AR-15 with 1/12 twist barrel

    Texasdave,

    The M193 isn't what you should use, it's just what the military did use as standard ball ammo for the M16 and M16A1 rifles. Lots of much better options out there, and almost all will beat the pants off the M193 in terms of accuracy. Most of the FMJ Ball stuff is about 2-3 MOA, or a bit better if it's a real good lot. Crappy stuff, but suitable for combat accuracy.

    The M855 is the longer 62 grain bullet, same as the SS109 NATO round, and needs a significantly faster twist to be properly stabilized. Out of your rifle, they'd tumble, keyhole and give horrible accuracy. Not dangerous to you or the gun, just won't be able to hit anything with these.

    Long450 gave you some good advice here, both in terms of bullet weight and powder choices. Try H335, H332, 748, N133 or N135 with bullets in the 45-60 grain range, and you'll get your best accuracy and decent velocity. Need the slower powders like RL-15, Varget of N140 when you get to the heavier bullets (69-82 grains), but your twist makes these a non-issue. Stick to the faster powders and you're good to go.
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      #6  
    Unread 09-06-2011, 03:56 PM
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    Re: AR-15 with 1/12 twist barrel

    Kevin;
    I really appreciate your advice. I was looking at Hornady's reloading manual and they used a 1/12 twist barrel in their 223 Remington testing. Which brings me to ask what do you think about BL-C2 powder?
    Thanks
    Dave
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      #7  
    Unread 09-06-2011, 03:59 PM
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    Re: AR-15 with 1/12 twist barrel

    A good powder, but not my favorite for this cartridge. Works, but I think there's several better choices, including others in the Hodgdon line. H322, H335 or even BenchMark are all good if you want to stick with Hodgdon. The H322 is particularly good for both velocity and accuracy with mid-weight bullets in this caliber.
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