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Frangible bullet ammo to limit collateral damage? Think again. (Report on experiments.) Login/Join 
Picture of sigfreund
This is a subject that appears from time to time, and it was raised again recently.
The question is whether frangible bullets are safe to fire toward other people in adjoining rooms because of the assumption that they will break up into harmless pieces when they strike building materials. I have long believed that because they had to resist the shock of being chambered and fired, breaking up by striking wood and wall board was unlikely at best. I had, however, never tested my belief myself. Now I have.

The following test was of course not as comprehensive as it could have been. I tested only two types of ammunition and against only one type of building material. But it did demonstrate that a certain building material (2×4 wood boards) did not eliminate the danger of passthrough by two types of bullets.

The test used Speer 357 SIG ammunition loaded with 100 grain bullets and remanufactured Ultramax 223 Remington ammunition loaded with 42 grain bullets. Both bullets appear to be made of copper powder and are intended to break up into tiny, less-dangerous fragments when they strike hard targets. I attempted to measure the velocities of the two loads, but without success, and probably because the targets were too close to the LabRadar unit.

The first two shots were fired through two 2×4 boards clamped together. When it became obvious that two boards offered no significant resistance to the handgun load, I went to using a single board. I used manila folder tagboard for witness behind the board and one gallon jugs filled with water behind the paper. Both rifle and pistol ammunition were fired at close range; about 3 yards for the pistol and about 10 yards for the rifle. Barrel lengths were 3.9 and 16 inches respectively (SIG P229 and carbine length AR).

The setup:

The first two exit holes through two boards:

The first shot veered off so far that it didn’t even hit the witness paper. The second shot hit high and right while tumbling. The third shot also missed the water jugs, but finally the fourth shot hit a jug.

Handgun entrance holes.

Witness paper after four shots, three of which hit the paper.

Handgun exit holes:

Water jug hit by handgun bullet:

Upper rim of plastic barrel struck by handgun bullet.

Loaded cartridge and broken bullet recovered after striking barrel clamp.

Entrance and exit holes from 223 ammunition.

Witness paper showing 223 bullet hits. The circled hole below the brown square paster was a sighter shot. The upper right two holes were evidently made by the bullet that broke in two. That shot struck the water jug.

Water jug struck by 223 bullet.

The last photo shows the imprecision and inaccuracy of the Ultramax load. The three holes at the lower right, one in the manila paper and two in the cardboard were fired from a hasty rest from about 27 yards. The three holes below the brown paster were fired from the same rest with Lake City M193 ammunition. Although a better rest and using a larger, easier to see aiming point would have probably resulted in a much smaller group, that’s about what I expect with that rifle and ammunition. (Four shots were fired for the group; the upper right hole was made by two bullets.) I regularly score the equivalent of head shot hits at 25 yards with bulk M193 ammunition and Aimpoint sight, but I wouldn’t try that with the Ultramax frangible.

In summary, both the handgun and rifle frangible bullets easily perforated the 2×4 board. All bullets tumbled after exiting the board, as would be expected of most projectiles. With possibly one exception, they did not break up as a result of passing through the board. They tended to veer off the original line of flight. The bullets that struck the water containers did cause significant damage. None of the damage seen in this test can be converted directly to wound ballistics information except for the fact that it’s obvious the bullets could have caused serious injury if they had struck a person.

This message has been edited. Last edited by: sigfreund,

“The fundamental cause of trouble in the world today is that the stupid are cocksure while the intelligent are full of doubt.”
— Bertrand Russell
Posts: 42216 | Location: 10,150 Feet Above Sea Level in Colorado | Registered: April 04, 2002Reply With QuoteReport This Post
Fighting the good fight
Picture of RogueJSK
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Modern frangible ammo serves one purpose: to minimize ricochets and frag from hard surfaces (metal, brick, concrete, etc.) during training. It's used as a training aid, to allow folks to more safely train in close quarter shoothouses and with close-range steel targets. (Otherwise, you're looking at minimum safe distances of like 15 yards for handguns and 50-100 yards for rifles, with normal FMJ on steel targets.)

As you noted, it is not designed to prevent penetration through drywall or other similar building materials. That is an internet fallacy.
Posts: 25266 | Location: Northwest Arkansas | Registered: January 06, 2008Reply With QuoteReport This Post
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thanks for posting this info


Proverbs 27:17 - As iron sharpens iron, so one man sharpens another.
Posts: 8006 | Location: Florida | Registered: September 20, 2004Reply With QuoteReport This Post
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