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Teflon / Nylon Coated bullets...for penetration.

2K views 10 replies 9 participants last post by  TXplowgirl  
#1 ·
In the old days they came out with Teflon coated bullets aka 'cop killers' due to their ability to penetrate body armor. Then they became illegal.

I never tried any of them, but did use the nylon coated bullets. Maybe nylon was just another moniker for Teflon, don't know. I still got a box of the nylon 9mm. Only shot a few of them, I bought them just for testing years ago. They do have a tremendous amount of penetration compared to uncoated 9mm.

https://www.targetsportsusa.com/cci...ci-blazer-herters-9mm-luger-ammo-115-grain-total-nylon-jacket-3575-p-59019.aspx

Anyone try these below for penetration tests? Are these coated bullets similar to the nylon coated bullets?

https://www.midwayusa.com/product/1021119189

Here are a few penetration tests of stacked newsprint I did years ago to give you an idea how various ammo performs.

.22 short 5/8 inch of newsprint (snubnose)
.22 quiet 1 inch of newsprint (snubnose)
.22 HVHP 2-3/8 inches of newsprint (snubnose)
.22 Stinger 3-1/4 inches of newsprint (snubnose)
.380 ball 3-3/8 inches of newsprint (Beretta)
.38 SP Federal ball 4 inches of newsprint (snubnose)
.357 Hornady plastic tip magnum 3-3/4 inches of compressed kraft paper (snubnose) (a)
.357 Hornady plastic tip magnum 6 inches of compressed kraft paper (Ruger 4" barrel) (a)
9mm Hornady 6-7/8 inches of newsprint (Beretta)
9mm Herters nylon jacket 10 inches of newsprint (Beretta)
.45 Auto ball 4 inches of newsprint (Colt 1911)

(a) I was starting to change the tests to use compressed Kraft paper and never got round to finishing them. Kraft paper offer more resistance than newsprint. If the .357 was shot into newsprint I think the penetration would be about 25% more.

Tests will vary depending on how the newsprint / Kraft paper is compressed. For instance, if you have a stack of flat Kraft paper bags and do not compress them, the bullets go through about double of what they would with compressed Kraft paper. And when I talk about compressed paper, I mean about 25% - 30% compression in a box. You fill a box with paper that extends about 25% - 30% over the lip, then compress the paper and tape the box shut.*

But there is no exact science in this. For if you use Kraft paper bags you will have variables such as the bottom fold of the bag has more layers than the top of the bag with 2 layers. The important thing to do is to test the all calibers in the same conditions so they are comparable.*

I mentioned this before, an auto pistol seems more efficient than a revolver. Too much gas loss with a revolver I guess. And you get the benefit of recoil reduction with an auto. But I still use lots of revolvers for being dummy proof and reliability. (OK, some issues with reliability with Rugers.)

It is interesting to see how much power is lost from the snubby barrel to a 4 inch barrel length when you look at the .357 magnum results. Sometimes will have to test a suppressor to see how that compares to unsurpressed.
 
#4 ·
The original Teflon coatings applied to 1960s - 1980s era armor piercing handgun ammo were to lessen ferocious damage to bore rifling. As many of those loads were tungsten alloy, hard brass alloy, or hardened steel penetrators that would wear out barrel rifling.

The Teflon had nothing to do with penetration of soft body armor. The high velocity, specially shaped, & super hard bullets accomplished that on their own. The Teflon was there to save your handgun barrel from becoming an increasingly inaccurate smooth-bore.

Allegedly, Teflon coating offered a slightly lower incidence of AP bullets doing glancing ricochets off of angled auto body panels and auto glass, but that's a fairly dubious claim. If it reliably worked like that, most military & police ammo would employ such coatings. They don't.
 
#5 ·
As said right up above me^^^^^^

There's a myriad of coatings used for bullets, none of them are for increased penetration

Most all are used for reducing bore fouling and chamber pressure

Nylon
Teflon
Lubalox (Black Talon bullets)
Molybdenum disulfide (Moly)
HBN (Hexagonal Boron Nitride)
WS2 (Tungsten disulfide)

Are all coatings designed for the aforementioned. Won't help with penetration

I've used the Lubalox, Moly and HBN on rifles and they do work by reducing the fouling. I can shoot more before accuracy degrades increasing time between cleanings. I prefer the Lubalox and HBN over the Moly.

Lubalox comes on the Combined Technology bullets (Nosler/Winchester) sold for rifles


If you want better penetration, go to a heavier bullet
 
#9 ·
When I shot the falling plate matches back in the late 1990s a couple of cops were talking about the Mexican Banditos gang drilling out the hollow points a little more in 357 mag ammo and gluing in the tips of cut off hardened nails into the hollow point so when the bullet hit a cops vest the bullet would stop but the hardened tip would continue on through the vest and into the body.

I never tried making any myself and had sort of forgotten about it. But it sounds like it would work if you used a lightweight HP like a 110gr bullet and loaded to max power for high speed.