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Boom Headshot - .50 style

Discussion in 'Rifle Country' started by George Hill, Jun 27, 2007.

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  1. George Hill

    George Hill Member

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    Last edited: Jun 30, 2007
  2. igpoobah

    igpoobah Member

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    That's nuckin futs!
     
  3. kcmarine

    kcmarine Member

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    HOLY CRAP.
     
  4. Jason_G

    Jason_G Member

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    Looked like it took a one-hopper before it hit poor Willie. It's probably a good thing, too! If you watch close it looks like the bullet kicks up some dust as it hits the ground just before hitting him in the head.

    Jason
     
  5. GotGlock

    GotGlock Member

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    Holy CRAP, the sound it made on incoming is freaking scary, like a small artillery round. That guy is lucky it hit the ground first.
     
  6. PercyShelley

    PercyShelley Member

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    To calculate velocity, one would need the velocity of the .50 bullet at 90 meters and the coefficient of restitution (COR how "bouncy" a material is) of a lead on steel collision. I suppose it would be important to subtract the air velocity of a tumbling projectile coming back another 90 meters, but that's trickier.

    I can't find exact numbers, but everywhere I read says that steel has a very high COR; your choice to avoid steel targets in the future is probably very wise. While lead has a low COR, it's pretty obvious now that the steel is springy enough to redirect bullets at shooters.

    Edit: Duh!

    Just read the blog.

    It's about two seconds from the steel target getting hit to the bullet returning. 50 ft/sec with a 700 grain projectile isn't anything to snort at.
     
  7. kcmarine

    kcmarine Member

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    Someone better be at church this Sunday...
     
  8. Nightcrawler

    Nightcrawler Member

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    That's not supposed to be possible!

    WOW!
     
  9. jlbraun

    jlbraun Member

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    Yay, math.

    It's about 1.3 seconds from the "ping" to the "thup-OW!". Sound takes about 0.3 seconds to travel 100 yards. So 1.6 seconds travel time, or 187 feet per second. That's about 52 foot-pounds with a 668 grain bullet (assuming a complete bullet hit your friend, unlikely).

    That's still quite a bit, about equivalent to a powerful BB gun. I think that bounce it took off the ground took a lot out of it.
     
  10. George Hill

    George Hill Member

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    I don't think a bb gun would knock the earmuffs off his head like that.
    Even the most powerful BB guns at 1400 FPS wouldn't do that. That slug, however much of it was left, still packed a lot of momentum.
     
  11. MarshallDodge

    MarshallDodge Member

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    WoW! :eek: I'm glad Willies OK.

    This last year at a bowling pin shoot a bullet came back 75 feet and smacked the backside of the scorer's laptop. It was enough to break the screen.
     
  12. Slamfire

    Slamfire Member

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    Perhaps too he was using ball ammunition which is far more prone to ricochet than a frangible bullet.

    I was talking to a fellow shooter at a Military range last year and we were talking range safety fan issues. If you are unaware the fan got bigger over time. He made the comment that you just don’t know what is going on with these FMJ type bullets because you can’t see them. However, he had been shooting 30 tracer at a berm with a machine gun and he said you would not believe, until you see it, the bullets emerging from the ground and exiting virtually all directions. Including straight back.

    The gun club I belong to just established a safe distance standard for metal targets and pistols. I have no idea what a safe distance is for .30 cal. We don’t allow 50 cal shooters, we don’t have the downrange safe zone. But from what I see, I think 200 yards still might be too close.

    Obviously this shooter was too close to the steel target with that 50 caliber. Lucky darn thing the bullet was spent.
     
  13. jlbraun

    jlbraun Member

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    George, consider the difference between energy and momentum. A 668 grain .50BMG bullet going 187.5ft/s has 22.6 times the momentum of a 6.9gr BB going 800ft/s.

    So, you're right. A BB gun couldn't knock Willie's muffs off, but a big ole .50BMG ricochet sure will, because it's got way more momentum - even though the two projectiles have the same energy. That ricochet has about the same momentum as a golf ball on a fairway drive. Ow!

    By the way, I read your site. Great review of the P-01, I bought one because of it.

    Egad. Back to work.
     
  14. ilcylic

    ilcylic Member

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    Hey, now that's a story topper for the bar.

    "Oh yeah? I got shot in the head with a .50 BMG!" :D
     
  15. heypete

    heypete Member

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    Was the steel plate vertical, or at an incline?

    When I shoot steel, I generally arrange it so it's closer at the top than at the bottom, such that anything striking it would be deflected into the ground. I usually use a 45 angle.

    If the plate was vertical, the bullet is much more likely to come back.

    Glad to hear he's ok. I'd need a new set of underwear if that happened to me.
     
  16. sm

    sm member

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    Between black coffee, and shiftn' gears
    Whoa!!
     
  17. Daemon688

    Daemon688 Member

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    So that's what a .50 sounds like comming at you :uhoh:

    I hope I never have such an experience.
     
  18. RecoilRob

    RecoilRob Member

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    Looks like the steel target was pretty tough stuff. My targets are 5/8 annealed 12"x12" and 12"x18" and AP goes right through while ball sticks the core over half-way in every time. And they go flying when hit.

    Shooting at something so big, heavy and tough that the core won't penetrate and the target won't easily move is inviting just such an unpleasant return visit from a rebounding core.

    But, the odds of getting the target set exactly square to the shooter, and him hitting it just right to get the bullet back to the head falls into the category of 'one of those amazing things that happen'.

    Very grateful that no injury was suffered...other than to the earmuff. And thanks a bunch for posting the video. It's a keeper!
     
  19. George Hill

    George Hill Member

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    Willie had the plate set back at a 45* angle, and 45* to the side as well. That it came straight back like this is very odd. Someone upstairs was messing with him.

    The muffs are the electronic Caldwells.
     
  20. Noxx

    Noxx Member

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    They were, anyway.

    Man that's a sound I never want to hear.
     
  21. R.W.Dale

    R.W.Dale Member

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    And that's why I don't shoot steel with anything jacketed
     
  22. fatelk

    fatelk Member

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    I still have a very faint scar right between my eyes from doing something similar with a 30-06. I was young and stupid and only about 50ft away with WWII AP. Ouch
     
  23. Dr.Rob

    Dr.Rob Moderator Staff Member

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    Wow.... that's all I can say.
     
  24. Well-Armed Lamb

    Well-Armed Lamb Member

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    Holy *crap,* Ogre. Glad your friend's okay. That footage is +2 to scary, and then some. The sound of that oncoming round dang near turns my bones to water; I can only imagine what it must have been like to be there.

    "That's the last one o' them we're doin'!" Wise men, indeed.
     
  25. Seancass

    Seancass Member

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    that is truely amazing to see. really glad he's ok!
     
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