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Thread: 1st rounds fliers...what causes them?

  1. #1
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    1st rounds fliers...what causes them?

    I've put together a new build meant for accuracy, and have noticed a trend for the 1st round to shoot outside the rest of the group, usually high and left, or high or left. Basically, notably outside the rest of the group in the 9:00-12:00 direction. The remainder of the group is usually very tight.

    Build:
    Sionics 18" barrel
    Geissele Mk8 Rail (used certified torque wrench and followed instructions)
    Vltor MUR
    Sionics parkerized BCG/CH
    BRT Covert Comp(barely above hand tight)
    Sionics assembled Lower
    Magpul UBR Gen2
    Sprinco Green Spring A5H3 buffer
    Geissele SSA-E trigger
    Vortex HS-T 6-24

    100 yards:
    20180528_164716.jpg
    20180528_164804.jpg

    200 yards after firing 5 rounds on steel, then shooting paper:
    20180526_094536.jpg
    20180526_094605.jpg
    20180526_094625.jpg

    My buddy built an identical rifle, minus the handguard and scope mount, and is seeing similar results. I asked him to fire the first round of his magazine into the berm before firing his five round groups and his group size dropped substantially.
    Last edited by taekwondopreacher; 05-28-18 at 18:04. Reason: Fixed pictures.

  2. #2
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    It is due to a cold shooter.

  3. #3
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    4th 200 yard picture:
    20180526_094642.jpg

    I'm hoping there is a solution to this, and this seems like the best place to ask. Thanks for any help.

  4. #4
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    Quote Originally Posted by KUSA View Post
    It is due to a cold shooter.
    That would be totally awesome. I have no problem with it being me.

  5. #5
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    The hand cycled rd. goes into battery at a different velocity than the self cycled rds. is my guess
    Common occurrence with an auto loader handgun.

    I’ll add I’ve seen this tendency lessen or disappear once lapped/broken in.
    Last edited by gaijin; 05-28-18 at 18:29.

  6. #6
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    Quote Originally Posted by taekwondopreacher View Post
    That would be totally awesome. I have no problem with it being me.
    It happens to me all the time also. Lowlight over Snipershide swears that there is no such thing as the cold bore causing a flyer but rather that it is the cold shooter.

  7. #7
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    This “cold bore shot flyer” phenomenon is mostly attributed to a non fouled bore.
    Most shooters log shots, they know how the flyer will deviate as compared to subsequent shots.
    Proper Planing Prevents Piss Poor Performance.......

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    How do you clean your barrel?

    To get consistent first shots, it is better to avoid aggressive solvents and use a CLP-type cleaner to clean out gunk and residue from the barrel, but leaving the copper behind.

    If you remove the copper, your shots will be inconsistent until a layer of copper has been deposited in the barrel again.

  9. #9
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    Quote Originally Posted by joffe View Post
    How do you clean your barrel?

    To get consistent first shots, it is better to avoid aggressive solvents and use a CLP-type cleaner to clean out gunk and residue from the barrel, but leaving the copper behind.

    If you remove the copper, your shots will be inconsistent until a layer of copper has been deposited in the barrel again.
    It's a new barrel that now has 235 rounds. I clean at about 400 rounds and remove the fouling as well with a quality bore cleaner. I know not to expect the best accuracy until the barrel fouls after a mag or two.

  10. #10
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    Quote Originally Posted by gaijin View Post
    The hand cycled rd. goes into battery at a different velocity than the self cycled rds. is my guess
    Common occurrence with an auto loader handgun.

    I’ll add I’ve seen this tendency lessen or disappear once lapped/broken in.
    My other SPR has 1477 rounds. I put about half of those through it last year, and don't remember the first shot phenomenon happening then. I can't tell you if it happened when it first started shooting that rifle because I was shooting a GI trigger and my groups weren't as good.

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