Ballistic gelatin test results : Air Guns


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Brass Fetcher
May 18, 2006, 02:47 AM
Don't know where else to post this, but I wanted to get the results out to you. Mods, if it makes a difference, the tests were done with pellet rifles. :)

This was an informal test, and I thought that I would try something new, as I am about out of gelatin powder and this should be my last test or two before I quit the gelatin for good.

Anyways, I used a pump-up Crosman 0.177" (the thirty dollar one from Wal-Mart) gun and a Crosman 0.22" gun (with ~ 20" barrel). No chrono was used, as the testing was done in my garage. The 0.177" was pumped ten times for all shots - likely giving a fairly constant 'juice' input to all 0.177" projectiles.

In order to increase expansion on the HP pellets, I cut a 'x' shaped cut into the face of the pellet using an X-acto knife. The cut went the length of the cavity, and stopped at the base of the cavity. The 'reversed' pellets were just that - I turned them around in the gun and fired them, giving hollowpoint-esque expansion. There are also two denim tests in there, to simulate a rodent with a thick hide (I guess :) ). Left to right in the pic is equal to top to bottom in the listing of results.

Gamo .177 Magnum (reversed) = 0.254”; Penetration = 1.54”

Gamo .177 Pointed (reversed) = 0.253”; Penetration = 1.50”

Gamo .177 Match (reversed) = 0.270”; Penetration = 1.50”

Beeman 0.22 Crow-Magnum (reversed, 1 layer of denim) = 0.320”; Penetration = 2.24”

Gamo .177 Match = 0.178”; Penetration = 3.03”

Gamo .177 Pointed = 0.174”; Penetration = 4.05”

Steel .177 BB = 0.171”; Penetration = 2.95”

Lead .177 BB = 0.176”; Penetration = 3.90”

Beeman 0.22 Crow-Magnum (reversed) = 0.318”; Penetration = 2.68”

Beeman 0.22 Silver Bear (reversed) = 0.360”; Penetration = 1.54”

Beeman 0.22 Silver Bear = 0.221”; Penetration = 3.78”

Unknown pointed lead pellet 0.22 = 0.216”; Penetration = 5.08”

Beeman 0.22 Crow-Magnum = 0.221”; Penetration = 4.21”

Beeman 0.22 (X-cut) Crow-Magnum = 0.240”; Penetration = 3.70”

Beeman 0.22 (4-layer denim) Crow-Magnum = 0.231”; Failure to penetrate
final layer

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griz
May 18, 2006, 08:30 AM
You got some impressive expansion with some of those. More than I thought they would expand. Thanks for the report.

JohnKSa
May 18, 2006, 11:47 PM
The unknown pointed pellet looks like it might be a Silver Jet to me. If you post a side view pic of it, I might be able to ID it.

Kinda surprised that the Crow Magnum's didn't expand. I would like to know the velocity on those--they are one of the few HP pellets that actually do expand if the velocity is sufficient.

Good test--and a good illustration of why conventional airgun hunting/pest control is all about precision accuracy. There simply isn't enough power in a conventional airgun to rely on anything other than perfect shot placement.

Brass Fetcher
May 19, 2006, 12:26 AM
I recall that name - they are Silver Jets. Thanks. I didn't get to use the chronograph, but the gun was a Crosman 2260, if that helps. The .177" gun was a Crosman Pumpmaster 760.

444
May 19, 2006, 12:37 AM
That was very interesting.
It is too bad that you didn't chrono them. That would have been even more interesting to see how pellet weight vs. pellet velocity plays out.

DBR
May 20, 2006, 02:42 AM
IMHO looking for expansion with air guns is the wrong approach. You need penetration. I have had the best results up to woodchuck size animals with 22 or 25 caliber flat point match pellets.

RyanM
May 21, 2006, 12:10 AM
Interesting. Is 10 pumps on a steel BB enough to get it up to calibration velocity? I ask not only for calibration purposes, but also because I'm looking for a cheap pump gun, so's I can calibrate my modeling clay at different temperatures. Using the extremely cheap junk from Wal-Mart, for now.

Brass Fetcher
May 21, 2006, 01:06 AM
RyanM,

It looks like you and I are both shopping at the same store. :) The calibration BB gun that I have used for 2 years is the Crosman 760 pumpmaster. In my part of Florida, year round, 16 pumps has given me no lower than 603 ft/sec muzzle velocity with a steel BB. Don't worry about hurting the gun - it's like a Jennings, if it breaks or needs cleaning, throw it away and buy another.

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