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Thread: 1/7 twist and 55 grain rounds

  1. #11
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    Quote Originally Posted by C4IGrant View Post
    Yes. It looks somewhat like a pattern to me instead of a group. I have only run this test using one type of ammo (might have had a bad lot). Generally a 1/7 twist barrel will over stabilize a 55gr bullet.

    I will try and shoot some other 55gr ammo at 100yds and 300yds to see how the groups open up.


    C4

    Thanks Grant.

    I already have a Super Match Stainless Steel Pac-Nor 1/12 3-groove barrelled .22-250 that I use for varmint work, but it would be nice to at least have a chance up to 300 yards using my 1/7 twist AR-15 using factory ammo like Hornady 55gr V-MAX. Quick follow up shots with little to no recoil sounds like fun.

  2. #12
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    I'm no rifleman, but can hit steel plates (about chest-sized) consistently at 100 and 300 yards with 55 grain Winchester .223 (white box), American Eagle .223 and Winchester USA 5.56 (also in a white box, but different markings). No idea on group size, but it's close enough for government work.

    As an aside, is there a problem with an agency that fields 64 and 77 grain loads but quals and trains with 55? I want to say no, but would be interested in opinions.

  3. #13
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    I think it depends on the ammo. My LWRC has a 1-7 twist tube. When loaded with 55gr. UMC remington it groups around two-two and a half at 100 yards. If I switch over to 55gr. TAP, I have a hard time telling how many rounds are in one hole. It does well with most bullet weights 55 and up. I havent fire much light stuff through it. I fired Mil frangible through it a bit indoors, not sure of weight but I think it's in the 40s, wasnt long shots but it did stay right together. No FTF, FTE, or anything common to frangible.

  4. #14
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    Quote Originally Posted by C4IGrant View Post
    Yes. It looks somewhat like a pattern to me instead of a group. I have only run this test using one type of ammo (might have had a bad lot). Generally a 1/7 twist barrel will over stabilize a 55gr bullet.

    I will try and shoot some other 55gr ammo at 100yds and 300yds to see how the groups open up.


    C4


    Hey Grant. Were you ever able to check groups at 100yds and 300 yds? Before spending an arm and a leg on a new scope and mount, want to make sure my barrel is capable of what I plan on using it for.

    Thanks.

  5. #15
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    Quote Originally Posted by C4IGrant View Post
    Typically if I am getting half inch groups at 100yds, I will see groups open up by about .25 around the 110-130yd mark.


    C4
    Irons offhand right?
    GET IN YOUR BUBBLE!

  6. #16
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    Quote Originally Posted by royta View Post
    Hey Grant. Were you ever able to check groups at 100yds and 300 yds? Before spending an arm and a leg on a new scope and mount, want to make sure my barrel is capable of what I plan on using it for.

    Thanks.
    I never got a chance to shoot any groups yet (sorry).

    Since every barrel is different, I would just get some 55gr ammo and see how your gun likes it.


    C4

  7. #17
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    Quote Originally Posted by mark5pt56 View Post
    Irons offhand right?

    That's how I roll!


    C4

  8. #18
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    The U.S. Military considers M193 as an acceptable substitute when M855 is not available for use in 1-7 twist barrels.
    The reverse isn't true for 1-12 barrels.

    I have found most 52 to 55 grain bullets to be fairly accurate out to 300 meters in my own 1-7 twist rifles.

    General rule of thumb for optimum accuracy at ranges to 500 meters;
    1-12=45-55 grain bullets
    1-10=50-60 grain bullets
    1-9=52-68 grain bullets
    1-8/1-7.7/1-7=60 to 80 grain bullets

  9. #19
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    Quote Originally Posted by onmilo View Post
    The U.S. Military considers M193 as an acceptable substitute when M855 is not available for use in 1-7 twist barrels.
    The reverse isn't true for 1-12 barrels.

    I have found most 52 to 55 grain bullets to be fairly accurate out to 300 meters in my own 1-7 twist rifles.

    General rule of thumb for optimum accuracy at ranges to 500 meters;
    1-12=45-55 grain bullets
    1-10=50-60 grain bullets
    1-9=52-68 grain bullets
    1-8/1-7.7/1-7=60 to 80 grain bullets
    We all have our idea of what "acceptable" is. The Military will accept an M16 or M4 that shoots 4MOA at 100yds. I would throw that weapon in the trash. YMMV.


    C4

  10. #20
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    I shot my 16" 1/7 at 200 yards the other week. I have an Aimpoint on the upper - so obviously no magnification.

    I used a big Shoot-N-See target which I estimate to be 8x8 or so. At 200, the dot covers the entire target. Shooting off of a sandbag, I kept all rounds on the target, but it did not resemble anything like a grouping.

    Ammo was XM193. Honestly, with an Aimpoint, I don't shoot any better than that at 200 with 55's with my 1/9 twist or 1/12 twist barrels.

    I need do a comparision with some better ammo and with my Meopta 1-4x.

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