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Old January 13, 2011, 06:28 PM   #1
Biff Tannen
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Studies of bullet SPEED!

I was recently referred to a wonderful site devoted to ballistics with regard to barrel length, ammunition, and bullet speed:
http://www.ballisticsbytheinch.com/
It was one of the most thorough and scientific (and down-to-earth!) studies I have ever seen.
My SPEED questions:
- Are there any other great sites you can recommend concerning bullet speed with regard to other ballistic factors such as expansion & mushrooming, clothes, distance, etc. ?
- Are there any ADVERSE effects of bullet speed, such as premature mushrooming, fragmentation, etc. that have been well documented or from your personal experiences?

Thank you!
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Old January 13, 2011, 06:33 PM   #2
James K
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Well, I used to blow up bullets fairly regularly as a trick, firing thin jacket .22 Hornet bullets out of a .22-250. The bullet vanishes in a puff of lead dust, disrupted by centrifugal force.

Jim
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Old January 13, 2011, 06:36 PM   #3
kozak6
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http://www.brassfetcher.com/ is good for ballistic gelatin testing.

http://www.theboxotruth.com/ is good for penetration and urban legend testing.

Unjacketed lead bullets can make a real mess in the bore and spooky things can start to happen if they are driven at too high a velocity.

Copper jacketed lead bullets start to disintegrate in flight once you start to drive them around 4000 fps or so.
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Old January 13, 2011, 09:32 PM   #4
Biff Tannen
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kozak6:
You really made my week with this link:
http://www.theboxotruth.com
Denim over waterjug tests (with the acceptance that 4 jugs = 12 inches of BG) in which they fetch the bullet to show you the expansion, make more sense to me than fancy-laboritory smoke-and-mirror tech tests.
Any more great links like this?
Thanks so much!
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Old January 13, 2011, 09:37 PM   #5
jimbob86
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Quote:
Copper jacketed lead bullets start to disintegrate in flight once you start to drive them around 4000 fps or so.
Less that that if you have a fast twist barrel: it is their rotational velecity that tears them apart.
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Old January 14, 2011, 12:46 AM   #6
Carne Frio
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Sounds like your interested in terminal ballistics. The site I'll
refer you to has a very complete and on going forum about
that topic. It will take you quite a while to get through just
the stickies. Have fun !

http://www.m4carbine.net/forumdisplay.php?f=91
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Old January 14, 2011, 10:49 AM   #7
Biff Tannen
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Big thanks to Carne Frio

Carne Frio:
Terminal and wound ballistics are lagely overlooked sciences, and I might have continued to overlook them, had you not brought them to my attention! A big thanks to you!
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Old January 14, 2011, 12:06 PM   #8
sirsloop
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Too bad they only have done handgun calibers...
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Old January 14, 2011, 12:12 PM   #9
brickeyee
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Quote:
Terminal and wound ballistics are lagely overlooked sciences
With a very large problem ... repeatability.

It is very hard to make more than general statements (CNS hits are often good stoppers) and observe effects based on ballistic gelatin testing (ever been attacked by gelatin?).

The variability of the path a bullet takes in actual tissue is a confounding effect very hard to sort out.
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Old January 14, 2011, 07:08 PM   #10
Biff Tannen
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Quote:
Brickeyee shed wisdom on terminal ballistics in saying "It is very hard to make more than general statements (CNS hits are often good stoppers) and observe effects based on ballistic gelatin testing"
Yes, I am begining to understand what you mean... Its the "controlled" group that sets the standard for the scientific experiment... And although ive never been attacked by a jug of water (haha), this is why I actually am gaining more insight from "water jug and denim" tests than just about anything else I have seen (despite however "unscientific" as they seem)! They are the only tests anyone can do, with the nearly identical setup, allowing results from different guns, barrel lengths, ammo, etc. that can be compared more easily than any others! Ill put more stock in a backyard bubba waterjug test on Youtube that I can watch for myself, than a manufacturer's own private gelatin tests that Ive never seen, which produce the perfect-looking mushroom on a sharp-looking chart!
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