#100515 - 01/16/12 01:24 PM
Displacement of Fluid by a Bullet
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Gregg Richter
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Registered: 01/18/04
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This slo-mo video shows the spectacular results of a high speed bullet hitting a can of tomato soup. The video was unclear as to whether or not it was an expanding type bullet, and I was unable to tell by looking at the bullet as it exited.
Maybe some of you sharper eyed sleuths can.
http://www.fieldandstream.com/blogs/gun-nuts/2012/01/high-speed-video-308-vs-soup-can
Note that some of the fluid comes back towards the shooter. I first heard about this phenomenon when described by JD Jones as "blow-back," in an issue of the SIXGUNNER a couple years ago.
I wish it showed the same shot with say, a .454 cast WFN and a Hornady XTP...
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http://www.hunterseyevideo.com Genesis 1:28 God blessed them and told them, "Multiply and fill the earth and subdue it. Be masters over the fish and birds and all the animals."
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#100518 - 01/16/12 01:52 PM
Re: Displacement of Fluid by a Bullet
[Re: Gregg Richter]
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Shortgun
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Registered: 01/18/04
Posts: 134
Loc: East Tennessee
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According to the box of ammo it is FMJ if they are firing a .308
Win.
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#100522 - 01/16/12 02:56 PM
Re: Displacement of Fluid by a Bullet
[Re: Shortgun]
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Gregg Richter
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I saw that ammo also, Shortgun, but don't like to assume it is what they used, but if so, imagine what the results would be if it was a hollow point.
_________________________
http://www.hunterseyevideo.com Genesis 1:28 God blessed them and told them, "Multiply and fill the earth and subdue it. Be masters over the fish and birds and all the animals."
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#100525 - 01/16/12 03:27 PM
Re: Displacement of Fluid by a Bullet
[Re: Gregg Richter]
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pab1
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Loc: SW Montana
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Great video!
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"If there must be trouble, let it be in my day, that my child may have peace."
Thomas Paine
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#100526 - 01/16/12 03:54 PM
Re: Displacement of Fluid by a Bullet
[Re: pab1]
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wapitirod
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Registered: 01/19/05
Posts: 5669
Loc: Tillamook, Oregon
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I like watching the ballistic gelatin testing since I figure it's the most real world for hunters. I want to do some testing this summer with different loads and calibers while I'm on vacation. I normally go to the middle of no where for vacation and spend my time sleeping and killing rattlers in the evening so I'm going to try and be more productive.
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I won't be wronged. I won't be insulted. I won't be laid a-hand on. I don't do these things to other people, and I require the same from them.- John Wayne http://www.dixiefirearms.net
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#100563 - 01/17/12 04:27 AM
Re: Displacement of Fluid by a Bullet
[Re: wapitirod]
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430RUPE
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Registered: 12/21/11
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VACATION? Your always on vacation aren't you? LoL
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#100578 - 01/17/12 10:18 AM
Re: Displacement of Fluid by a Bullet
[Re: Gregg Richter]
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98Redline
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Registered: 10/10/10
Posts: 153
Loc: Eastern PA
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Note that some of the fluid comes back towards the shooter. I first heard about this phenomenon when described by JD Jones as "blow-back," in an issue of the SIXGUNNER a couple years ago.
I think what you are seeing is the applied result of Pascal's pressure law.
When the bullet enters the soup can, it essentially pressurizes the fluid in the can. When the can ruptures, fluid will squirt out of every available hole to relieve the pressure, pretty much regardless of whether that is forward, backward, up or down.
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#100612 - 01/17/12 09:41 PM
Re: Displacement of Fluid by a Bullet
[Re: 98Redline]
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Gregg Richter
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Thanks for sharing that.
So factually and scientifically, even if there is "only an entrance hole," if ENOUGH PRESSURE on the body fluids is generated, there should be blood exiting.
This was shown in a photo accompanying the article I mentioned from THE SIXGUNNER.
_________________________
http://www.hunterseyevideo.com Genesis 1:28 God blessed them and told them, "Multiply and fill the earth and subdue it. Be masters over the fish and birds and all the animals."
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#100622 - 01/18/12 01:28 AM
Re: Displacement of Fluid by a Bullet
[Re: Gregg Richter]
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doc with a glock
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Registered: 06/05/08
Posts: 569
Loc: Montana, USA
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Gregg,
He is shooting an M1A in the clip, although in the intro here has an AR. At the end of the clip you see the M1A. Assume it is a 308? Most likely.
Doc
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#100629 - 01/18/12 07:26 AM
Re: Displacement of Fluid by a Bullet
[Re: Gregg Richter]
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98Redline
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Posts: 153
Loc: Eastern PA
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Shooting a soup can and shooting an animal are two very different things. Some notable things that come to mind are:
1: The soup can has a significantly lower volume than any game animal. This will cause the pressure spike inside the can to be significantly higher than inside the animal and thus the effects of the overpressure to be much more dramatic.
2: Skin and hide tends to be very elastic. It stretches out then returns to shape very well, the metal, not so much. this will allow the hide to expand to soak up the overpressure without a massive pressure related rupture like you have in the soup can.
3: Animals are not solid fluid through and through, things like the lungs and stomach are very compressible which do so to increase the internal volume of the animal and further reduce the pressure spike. The soup can is filled with an incompressible fluid like a hydraulic cylinder.
4: There are all sorts of things that happen in front of and behind the bullet with respect to dynamic pressure waves
So the very long answer is that there are no absolutes with respect to blood trails. If you look at high speed camera images of animals being shot you can see the pressure waves ripple across the hide and/or the body expand to absorb the overpressure condition. The more animals I shoot the more I realize that every single one is different.
While not perfectly scientific, I would think that a better analogy would be to shoot a 3/4 filled 5 gal bucket with the top on and a 2" hole cut in it. The volume would be much closer to the body cavity volume of a deer than is an 8oz soup can and the airspace in the top of the bucket and the hole would allow for compression of the air and venting (similar to the lungs collapsing and air being forced out the mouth and nose). My guess is the results would be not nearly as impressive as the exploding soup can and probably make for a pretty dull video.
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