Taper crimping?

Discussion in 'Handloading and Reloading' started by Lizzie Borden, Apr 12, 2021.

  1. Lizzie Borden
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    Lizzie Borden Contributing Member

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    One very big oops. I fired a round in my Polytech M-14s that hadn't been taper crimped. The bullet lodged in the barrel and Idiot Moron Trigger Puller failed to notice that little teeny fact. The loads I was using were running around 2900 fps and the next bullet blew out the side of the barrel. No idiots were harmed.

    How much taper crimp is enough for a semi-auto .308?
     

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  2. Hooda Thunkit

    Hooda Thunkit Member

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    All I can say is : Holy split barrel Batman ! You are lucky nobody was hurt !

    Perhaps you should stick to axes Lizzie.:)
     
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  3. DocRock

    DocRock Member

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    I take it that you were not injured? Hoping so.

    I am unclear as to why you ascribe the barrel obstruction that caused the subsequent rupture to insufficient crimp. Could you clarify ?
     
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  4. CoalCrackerAl

    CoalCrackerAl Member

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    Glad your ok. I see where some say you don't need to crimp rifle rounds. Some say only bullets with a cannelure to crimp. I crimp everything. I have not had any issues with performance by doing so. I crimp where the casing and bullet sorta meld together. IE no real sharp edge felt where they meet. Is the best way i can explain it.
     
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  5. MEHavey

    MEHavey Member

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    No crimp is req'd with the 308Win w/ anything approaching standard brass condition.*
    Something else played out here.

    * and if your brass/neck tension is so loose as to require one... you've got bigger problems

    .
     
  6. Walkalong

    Walkalong Moderator Staff Member

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    I’m glad you are ok. The lack of a taper crimp did not cause this. Perhaps lack of neck tension.

    My question would be why a stuck bullet? No powder, too low of a charge?
     
  7. drband

    drband Member

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    Wow—just wow. That does not look crimp related to me.
     
  8. FROGO207

    FROGO207 Member

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    I am with MEHarvey and Walkalong there is something going on other than the amount of taper crimp. Have you got any of the ammo left that you did not shoot that you can take a picture of? What bullet and load were you using? This might help diagnose your problem. If things dont feel the same check things out. It'll save you money in the long run.
     
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  9. MEHavey

    MEHavey Member

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    The bolt actually cycled with the that first/stuck round?
     
  10. Lizzie Borden
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    Lizzie Borden Contributing Member

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    I don't do axes. I do swords.
     
  11. Lizzie Borden
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    Lizzie Borden Contributing Member

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    These are commercial reloads from Freedom Munitions in Lewiston Idaho. I pulled the bullets on 10 rounds to check charge consistency - they were okay for commercial reloads. I re-seated the bullets and taper crimped the rounds.

    A short charge is a real possibility, I had two squib loads that cleared the barrel at a velocity of about 1100 fps. With the third squib load, I didn't check the chronograph. Bad mistake.

    My only injury is my pride. I've never done something that stupid with a firearm. I was shooting prone and the barrel ruptured on the left side, so I was clear of the shrapnel and I was shooting in the back yard.

    I suppose the smart thing to do next is weigh all the rounds, looking for light outliers.
     
  12. Lizzie Borden
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    Lizzie Borden Contributing Member

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    Thinking about it - no, it did not. Missed Red Flag number 3.
     
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  13. DocRock

    DocRock Member

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    Glad you were not injured. Sorry that your rifle was. A bullet obstruction like does not arise from insufficient crimp. An insufficient charge seems most likely.
     
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  14. Lizzie Borden
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    Lizzie Borden Contributing Member

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    It's obvious a sign from above that I need to dump the Polytech and buy an SA M1A.
     
  15. FROGO207

    FROGO207 Member

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    I would be chucking that propellant and reload using a proper amount of somethimg I knew was a good load. You might want to let them know what happened. Might save someone else a rifle.
     
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  16. Lizzie Borden
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    Lizzie Borden Contributing Member

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    A quick weight check of 20 rounds was disturbing. The cases are all LC 17 and the weight variation was +/- 5 grains. I haven't weighed the powder, but I'm guessing the charge is supposed to be between 40 and 44 grains. If the variation is solely due to the powder, that's a 12% variation in the charge. I'm sure it's not just the powder; there's variation in bullet and case weight.

    I think I'm going to be unloading and reloading a bunch of ammunition, because I'm not putting this stuff in my Savage 99.
     
  17. n2omike

    n2omike Member

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    A SINGLE squib load is too many. If you had TWO that barely exited the barrel, followed by the one that didn't... you need to find a new ammo source!!!
     
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  18. MEHavey

    MEHavey Member

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    OOC: What "type" (appearance) was the powder when you dumped it -- stick or ball/spheroidal ?
     
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  19. Lizzie Borden
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    Lizzie Borden Contributing Member

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    I've decided that I'm going to rely on my Lyman Turret press.
     
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  20. DocRock

    DocRock Member

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    Check whether the LC brass will even chamber well in your 99. Mine did not like milsurp brass at all, even when resized with a small base die. At the time I mentioned this, several folks chimed in with similar observations about milsurp brass and their 99s.
     
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  21. rfwobbly

    rfwobbly Member

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    The brass will vary by 5 grains. You can't weigh finished cartridges and really tell anything.
     
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  22. Lizzie Borden
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    Lizzie Borden Contributing Member

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    It's ball powder. Single cartridge charge was 44.7 grains.

    Just to shame myself further, I should also have realized that something was terribly wrong when my chonometer was clocking some rounds at 2900+ fps.
     
  23. 243winxb

    243winxb Member

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  24. Lizzie Borden
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    Lizzie Borden Contributing Member

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    My 99E has been happy with a steady diet of milsurp brass and ammo. It particularly likes RA 64 brass.
     
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  25. Lizzie Borden
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    Lizzie Borden Contributing Member

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    Overall, I think we can all agree that I was stupid and unobservant. And I really appreciate having people tell me where I went wrong.
     
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