Key-holing

Discussion in 'General Firearms Forum' started by China boy, Sep 7, 2015.

  1. China boy

    China boy

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    When I shoot 158gr 38 special out my SP101 it makes keyholes on my target. What's the deal? What ammo should I get next for this gun? Anyone want to explain what's happening?
     
  2. method

    method

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    The bullets aren't being stabilized....or their stability is being disrupted by something. Is the rifling in good shape? Is the crown square and in good shape? Is that the only ammo you've tried?
     

  3. AZ Husker

    AZ Husker

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    Poor rifling, a fouled barrel, or crappy ammo.
     
  4. DWARREN123

    DWARREN123 Grumpy Old Guy

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    Is it a 38 spl gun? If 357 mag check the chambers for fouling rings caused be shooting 38 spl in a 357 mag.
     
  5. arkdweller22

    arkdweller22 Cuhootnified Roamer

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    Also, try changing bullet weight. See if the keyholing stops.
     
  6. md2lgyk

    md2lgyk

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    My wife's S&W Model 52 used to keyhole with wadcutter loads after a few hundred rounds. Very accurate target pistol, but it sure took a lot of barrel cleaning.
     
  7. willie_pete

    willie_pete NRA Life Member

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    I assume this is factory ammo and not reloads. If reloads, get them going faster.

    wp
     
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  8. DonD

    DonD

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    As Wille Pete said, if they're handloads, they're probably moving too slowly in that barrel length, speed them up or possibly, the slugs are so soft that they're skidding through the rifling combined with marginal velocity. Don
     
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  9. China boy

    China boy

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    The ammo is from freedomunition and the barrel is a 3 inch. I have a half box of brand name rounds. I'm going to see if these keyhole too.
     
  10. willie_pete

    willie_pete NRA Life Member

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    We would try things in this order

    check barrel , chambers and forcing cone for lead, if ok
    Shoot different brands/weights of factory ammo, if all keyhole
    Take to a good gunsmith and let him look at it, timing may be off, rifling may be bad, if nothing shows up,
    Then send it back to Ruger.

    I shoot a 4" 101 in IDPA and it shoots everything.

    wp
     
  11. AZ Husker

    AZ Husker

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    Cheap ammo and a short barrel are an automatic tragedy.
     
  12. ChiefWPD

    ChiefWPD

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    As others have mentioned, I'd check the barrel for leading. A good professional cleaning of the barrel can't hurt!
     
  13. TheDreadnought

    TheDreadnought

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    My .45 FMJ remanufactured ammo from Freedom Munitions keyholes quite often too. That's from a 4.5 inch barrel. I've got some American Eagle lying around, I'll have to compare them.