Author Topic: Preparation for the Coming Deer Season... Ballistics Gel  (Read 1263 times)

Bullfrog

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Preparation for the Coming Deer Season... Ballistics Gel
« on: March 26, 2018, 03:45:35 AM »
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I'm shooting my .30 Flex set for 72-74fpe at the muzzle. The ballistics gel is typical Knox gelatin mixed for a 12.5% ratio (I followed the standard recipe from the 'net, which actually works out to 12.5% instead of the standard 10%, which means this gel is a bit denser than the FBI standard). All shots are from 50 yards. I've tested all my .30 pellets, but because this video was getting lengthy I only showed the 44.75 JSBs. 50 gn JSBs perform the same.

The main thing I want to show is how the skirt of the pellet becomes a cutting edge as it passes thru. The wound channel looks like a boat prop cutting thru water. I'm not sure I've heard of much discussion before in airgun hunting circles about how a pellet's skirt cuts as it passes.



Alan

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Re: Preparation for the Coming Deer Season... Ballistics Gel
« Reply #1 on: March 26, 2018, 06:29:55 AM »
Very interesting information.

There is one aspect none of us can predict with respect to shooting a live animal—where the projectile strikes. While internal and external ballistics are very well known sciences, terminal ballistics (of flesh) are almost a hit or miss scenario (no pun intended). After all, none of us know the density of the impact area, nor how adrenaline—driven the animal is.

Also, what little similar testing I have done, has been with modeling clay as a medium. Aside from the density differences, clay tends to keep its shape after impact. To me at least, the hollowing effect of pellets is rather amazing. You called it cutting by the skirt (I have no argument with that), but in clay it is caused by the pellet spreading out and expending all of its energy inside the clay block. If they do this inside an animal, no wonder they drop dead on the spot!

In any case, it's really nice video.
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Briar Patch

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Re: Preparation for the Coming Deer Season... Ballistics Gel
« Reply #2 on: March 31, 2018, 09:27:57 AM »
That is a cool video.  Seeing the way the pellets had the spiral cutting action in the gel, and then hearing the effects of pellets in clay - darn interesting stuff. 

Makes me wonder if there isn't a lot more to come regarding pellet design and makeup. Specialized pellets for achieving specific results.
Same thing with PCP airguns in general. Systems designed to operate at even higher pressures than can currently be done.
Seeing how much the industry has progressed in along those lines in the past 10 years, and then how quickly things have improved in the past 5 years.

Seems to be a very short time between when talented & inquisitive geniuses like Bob, Travis, Lloyd etc. come up with ideas and improvements - and they start to be implemented across the industry.

Look at the difference between the first atomic bombs where aircraft had to be modified to make them fit inside, and the short time it took to come up with the H-bomb which is so much more powerful, and the Davey Crockett  which was so much smaller.

And for any overly sensitive people -
No, I'm not putting  those guys into the same group as bomb makers.

Anyway - lots of cool stuff in the airgun world.  :)
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Monkeydad1969

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Re: Preparation for the Coming Deer Season... Ballistics Gel
« Reply #3 on: April 09, 2018, 09:38:48 AM »
Nice educational vid.  You really need to do more of these.

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steveoh

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Re: Preparation for the Coming Deer Season... Ballistics Gel
« Reply #4 on: April 09, 2018, 10:18:58 AM »
So cool. Now I want to make some Ballistics Gel, and see how my various air rifles penetrate. 
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