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Here's a mystery for you...

Discussion in 'Handguns: Autoloaders' started by Snowdog, Apr 15, 2003.

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  1. Snowdog

    Snowdog Member

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    Today, I took the liberty of firing a few rounds into playdough from my .45acp Llama.

    After the brief Playdough carnage, I noticed something I couldn't explain. Recovering the spent slugs from Playdough, I noticed that all 185gr Georgia Arms JHPs (G45AG) I was testing failed to expand. This is the only factory JHP that I know of that won't expand in Playdough.

    However, the most interesting aspect was the spent slug itself. I noticed that on one side of the slug, there is a lot of powder residue, yet on the opposite side, there is hardly any. There were identical markings on all the slugs recovered. What do we know can causes this? Could there be something wrong with the barrel?

    One side of .45acp is noticeably carbonized (left) and the opposite side is not. Is there some kind of gas blowby happening here, or some kind of conspiracy?
    [​IMG]
     
    Last edited: Apr 15, 2003
  2. Flashpoint

    Flashpoint Member

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    Hmmm. That is interesting. I don't have an answer for you, but I do have a question. Where do you get 60lbs of playdough?
     
  3. Snowdog

    Snowdog Member

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    Where do you get 60lbs of Playdough? Easy... go to the toy section of any Walmart and clean the shelves. Be prepared to spend about $80. :(

    But, in retrospect, I don't think I could have done any better.
     
  4. WonderNine

    WonderNine member

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    strange....very strange....

    :D
     
  5. New_comer

    New_comer Member

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    I'm just "imaginating" these so, here goes:

    Try shooting at cardboard. If they keyhole, you might have a busted barrel. Also explains why the slugs dont expand: they hit the clay sideways...

    Check also for rifling marks if they're present all around the slug, maybe to allow you to determine a balanced fit of the barrel around the moving slug...

    Just a few of the possibilities. Hope these help.
     
  6. hksw

    hksw Member

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    Sounds to me like the concentricity of the lands to the grooves is off. That is, the grooves are more shallow on one side than the other. Could cause the round to tumble as New_comer mentioned.
     
  7. DJJ

    DJJ Member

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    More speculation

    Could be your chamber isn't perfectly circular (like slightly egg-shaped). The case mouth may be expanding a little more into the oblong part and letting some gas blow past the bullet just as it's leaving the case.

    What happens with other brands?
     
  8. ajacobs

    ajacobs Member

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    whewww, I though before i got to the picture that you were talking about their gold dots.
     
  9. Mal H

    Mal H Administrator

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    That is interesting. You can see the land pattern on the darkened side of the bullet.

    A few things I would check:
    Use a caliper or micrometer on an unfired bullet from the same box and be sure it is both completely round and is the proper diameter.

    Slug your barrel with a soft lead bullet and mike it all around. That will tell you if the barrel is out of round and what the actual bore dimension is. Actually, you may not need to slug the barrel but could use the recovered bullet since it was apparently not deformed by the Playdough. That would be valid only if the test of the unfired bullet showed it to be perfectly round.
     
  10. Al Thompson

    Al Thompson Moderator Staff Member

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    How's the pistol's crown? Have you tested for accuracy?
     
  11. Snowdog

    Snowdog Member

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    Thanks for the responses. I've been giving thought to slugging the barrel as well.


    Yep, I was quite pleased with the accuracy of this little pistol. Though in a different catagory than my Kimber, it is more than adequate for just about any use I can think of (other than competition).
    From this same pistol, I've tested Gold Dots, older model Black Talons, Hydra-Shok and Golden Sabers... all expanded in playdough. I'm thinking the lack of expansion is due to mild velocity and a poorly constructed JHP (there are no serrations to aid in expansion).
     
  12. Freightman

    Freightman Member

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    I saw a strange thing the other day, went to the range and while I was setting my target at 25 yds I looked down and there laid a 9mm JHP with searations on the ground. After further investagation I found it to be a spent bullet by the land marks on it. What was strange is that it had hit the angle iorn frame flat and did not flatten out or expand it only flatned the tip.
    The only thing I can figure out is that it was way underloaded as it miked out at .355.
     
  13. Al Thompson

    Al Thompson Moderator Staff Member

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    Well, if accuracy is good, there goes the crown theory. :)
     
  14. Jim K

    Jim K Member

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    It looks to me like the barrel is slightly bulged out on one side. This could be due to damage of some kind, but it really does not surprise me in a Llama.

    Jim
     
  15. Brian Williams

    Brian Williams Moderator Emeritus

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    Playdough receipe

    2 cups flour
    2 cups water
    1 cup salt
    1 table spoon of oil
    2 teaspoons of cream of tartar
    put in pan and stir and cook at low heat until mixed and doughy

    this is cheaper than store bought
    ohh
    add food coloring for desired color
     
  16. SDC

    SDC Member

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    Is the chamber maybe not concentric to the bore? Other than that, I can't really imagine how gas blow-by can happen on one side of the bullet and not the other :confused:
     
  17. blades67

    blades67 Member

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    Sounds like the problem is the bullets themselves. :scrutiny:
     
  18. Dr.Rob

    Dr.Rob Moderator Staff Member

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    I'd suspect the case mouths on the factory ammo weren't crimped or that the brass wasn't circular, after all your other ammo doesn't show this.
     
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