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Thread: What causes keyholing?

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    What causes keyholing?

    Is it the ammo or the rifle?

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    Re: What causes keyholing?

    Could be both.

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    Re: What causes keyholing?

    both to long of a bullet in a barrel that has to slow of a twist. you you could im me wat bullet your using i could tell you wat twist rate u need.


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    Re: What causes keyholing?

    Could be either, need more info......

    Keyholing at what distance?



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    Re: What causes keyholing?

    1 out of every 20 or so rounds on rapid fire is keyholing.
    Noveske N6 with FGMM

    12.5 barrel
    1:10 twist
    50 yards

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    Re: What causes keyholing?

    168 and 175 grain FGMM

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    Re: What causes keyholing?

    what distance???
    If you aint Cav, You aint sh*t


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    Re: What causes keyholing?

    50 yards

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    Re: What causes keyholing?

    shit equipment and you cant shoot.
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    Re: What causes keyholing?

    as the bullet slows down to the point of sub sonic it starts to become sub sonic and starts to become unstable.
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    Re: What causes keyholing?

    If the rifle is keyholing at 50yds with a known good factory load (FGMM) then you definately have something wrong with the bore.



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    Re: What causes keyholing?

    Then again, its a 12.5" barrel (which in my opinion has no place on a 308 that anyone expects anything other than a high CDI factor from).

    Bet you also have a bitchin' muzzle flash!



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    Re: What causes keyholing?

    First thought, is the barrel is shot out. Second one is you have another major problem with it. A 1:10 twist should handle up to 220 grain bullets with no problems.



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    Re: What causes keyholing?

    Dirty bbl, I had this issue some time back - cleaned my rifle and the problem stopped. I think that at the time I had run over 300 – 400 round prior to cleaning.

    I typically clean my rifle after every range visit.

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    Re: What causes keyholing?

    Even a fouled 12.5 inch barrel should be putting FGMM out pointy end first for quite a ways......

    Are you shooting with a can? Is there any possibilty the bullet is striking something on the way out (baffles or compensator if so equipped)?



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    Re: What causes keyholing?

    Who shoots at 50 yds???

    sight in is at 100 or 300 then 600 to 1000. you need to enjoy the capability of the catridge 50 yds gives no satisfaction

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    Re: What causes keyholing?

    Originally Posted By: Bill Stoffels
    Who shoots at 50 yds???

    sight in is at 100 or 300 then 600 to 1000. you need to enjoy the capability of the catridge 50 yds gives no satisfaction


    did you see the 12" barrel part? i would think the rifle was designed for 50 yards and in and maybe a maximum affective range of 300 yards.


    i would have to guess that there is something wrong with the barrel or you are having baffle strikes if you are using a suppressor like someone earlier mentioned.
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    Re: What causes keyholing?

    Originally Posted By: sobrbiker883
    Even a fouled 12.5 inch barrel should be putting FGMM out pointy end first for quite a ways......

    Are you shooting with a can? Is there any possibilty the bullet is striking something on the way out (baffles or compensator if so equipped)?

    The bullet is coming out pointy end first (duh) but it's either not spin stabilized because of the heavy fouling, OR it's being tipped by something at the exit - misaligned flash hider or compensator?

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    Re: What causes keyholing?

    Something wrong with the crown? I have seen copper fouling cause stability issues as well.



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    Re: What causes keyholing?

    Probably heavy fouling.
    spindrift ['spin,drift] verb- (Sniper / Long range shooting)
    A ballistic phenomenon that can cause a rifled bullet to drift in a direction opposite it's spin.
    also see: canted retical

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    Re: What causes keyholing?

    There was a thread on this for a 5.45 and it turned out to be cheap ammo.

    Remember twist rate is relative to velocity... so with a 12" barrel, you might need a faster twist. I dont know.
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    Re: What causes keyholing?

    Originally Posted By: AZPrecision
    Remember twist rate is relative to velocity... so with a 12" barrel, you might need a faster twist. I dont know.

    The short barrel will yield a lower muzzle velocity, which would help with tipping stability. I wonder whether the bullet is fully spun up in that short distance? Add a lot of carbon in the grooves and it's not spinning fast enough to be stable when it exits.

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    Re: What causes keyholing?

    For every formula i know how to run it should stabilize fine if my velocities are right. I would have to point twords dirty barrel

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    Re: What causes keyholing?

    Originally Posted By: AZPrecision
    There was a thread on this for a 5.45 and it turned out to be cheap ammo.

    Remember twist rate is relative to velocity... so with a 12" barrel, you might need a faster twist. I dont know.


    Actually the 5.45 S/W you referred to that was keyholing turned out to be a 556 bore chambered for 545, not bad ammo. The owner did remove the FH and inserted a 545 round nose first in the muzzle and it slid in to the case, tried a 556 round and it didn't go past the ogive.

    In this case I still want to hear fif there's a muzzle attachment or can.



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    Re: What causes keyholing?

    Barrel length is not going to affect stability. Yes its going slower but a 10 twist will work with close to a 200 grain bullets even shooting them sub sometimes. I just cant see that being the problem. I could be wrong though....



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    Re: What causes keyholing?

    Pictures are always more fun.



    80gr SMK (Tubb's Final Finish) out of a Savage 1:12 22-250 VLP at break-in and at 25 yds.

    Chris

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    Re: What causes keyholing?

    Originally Posted By: ChrisGarrett
    80gr SMK (Tubb's Final Finish) out of a Savage 1:12 22-250 VLP at break-in and at 25 yds.

    Chris


    What velocity were you running the FF boolits with?



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    Re: What causes keyholing?

    Originally Posted By: ChrisGarrett
    Pictures are always more fun.



    80gr SMK (Tubb's Final Finish) out of a Savage 1:12 22-250 VLP at break-in and at 25 yds.

    Chris



    i heard they take a little ways to stabilize. you'll be fine [img]<>/grin.gif[/img]
    I might get drunk and rob a bank, shoot my car if it don't crank. Try to raise a little Cain, mess the walls up with some paint. Might even join a rodeo, ride my horse to Buffalo, change my name to Bill, I don't think I ever will But I can't promise you I won't. Some people do, some people don't.

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    Re: What causes keyholing?

    They do!
    This is totally normal for the first hundred or so yards.
    spindrift ['spin,drift] verb- (Sniper / Long range shooting)
    A ballistic phenomenon that can cause a rifled bullet to drift in a direction opposite it's spin.
    also see: canted retical

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    Re: What causes keyholing?

    those are the new top secret squirrel tumbling devastator rounds that the special people developed for use on super clandestine missions. they perform best when fired from a sks sniper rifle.
    dhs wants to put ther dik in our arse, thanks obama!

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    Re: What causes keyholing?

    Originally Posted By: ChrisGarrett
    Pictures are always more fun.



    80gr SMK (Tubb's Final Finish) out of a Savage 1:12 22-250 VLP at break-in and at 25 yds.

    Chris


    Looks like they only keyhole when they get close to something orange. Aim away from the center.

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    Re: What causes keyholing?

    you guys are funnier than southpark! Thanks for the laugh!