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Old 10-30-2005, 04:58 PM   #1
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7.62 API round

There are so many types of metal variants out there I will simplify by using APC metal as a standard, since this is what this round more or less was designed for.

What is the thickness of metal required to protect against this round.

Someone was telling me how they would shoot nearly empty gas cans with either tracers or API.

Just got me wondering on how much metal the AP round could penetrate.
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Old 10-30-2005, 05:10 PM   #2
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I don't know the specs of 7.62 AP as far as weight and velocity but I have tested lots of M2 ball from 30/06 rounds(162gr at 2850) and it will shoot through 3/4" of T1 laminated steel. Regular ball ammo will not even dent these plates,we shoot them with our 5.56mm and 7.62mm rifles all day long and then spray a coat of paint on them to keep them from rusting.

I tried to recover one of the cores once,like a .24 or .25 hardened steel dart,from the 4th plate of T1. It was sticking half way through the plate and I tried to hammer it out. IT DIMPLED THE HAMMER FACE and never moved the core . AP is some bad stuff. TJR
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Old 10-30-2005, 06:54 PM   #3
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T-1 laminated steel? can you give me some more info on the specs for this stuff? Some friends and I are interested in fabbing up a few steel targets.... and we have already discovered that even regular ball ammo buts big craters in mild steel plate. Something that we could shoot with 7.62 and 5.56 ball ammo at a hundred yards without denting it would be nice.
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Old 10-31-2005, 06:05 AM   #4
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Quote:
Originally Posted by MarkG
T-1 laminated steel? can you give me some more info on the specs for this stuff? Some friends and I are interested in fabbing up a few steel targets.... and we have already discovered that even regular ball ammo buts big craters in mild steel plate. Something that we could shoot with 7.62 and 5.56 ball ammo at a hundred yards without denting it would be nice.
You know what I know about these plates as of right now. We shoot them all day long at 100 yards and don't even dent them a bit. The head range officer told me when I asked they were T1 laminated steel,not being a metallurgist I nodded my head and smiled. I would assume that any metal fabricating shop would be able to make you something to suit your needs. The ones we use are 1/4". Only bad part is they are held together with regular mild steel bolts and frames and one bad hit requires a new frame or bolt. We keep our range house full of extra bolts,but a shot frame requires a new target.

That's how I get to shoot the old ones with AP TJR
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Old 10-31-2005, 01:55 PM   #5
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Wether or not a bullet will penetrate steal has a LOT to do with distance and angle. I have found that at distances of 50 meters at an angle of 90 degrees, ball ammo will penetrate quarter inch steel plate without trouble. At great distances or angles other than 90 degrees (perfectly perpendicular) I have found it has trouble penetrating the steel. I have not played with the API. Its too expensive to shoot
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Old 10-31-2005, 01:56 PM   #6
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30-06 AP ammo is some good stuff. I have shot it clean through a piece of 3/4 inch mild steel. http://masterpostemple.bravepages.com/ Has the original military specs listed for several different calibers. Caliber .30 AP M2 is as follows.

Quote:
Cartridge, Caliber .30, Armor Piercing, M2

Use:
M37, M1919A4 and M1919A6 Machine Guns
Rifle, Caliber .30, M1 (Garand)

Description:
Armor Piercing. Cartridge is identified by a black bullet tip.

Function:
Penetration, fired at 7/8 inch thick homogenous armor plate at 100 yards, will not be less than .42 inch.

Weight - 424 grains
Length - 3.34 inches
Primer - Percussion (Crimped into case)
Propellant - WC852
Charge - 55 grains
Projectile - 165.7 grains flat based w/ steel core
Chamber Pressure - 54,000 psi
Velocity - 2715fps, 78 feet from muzzle
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Old 10-31-2005, 05:03 PM   #7
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Having never heard of laminated steel I can't comment on it. Sounds expensive though. However, there are several sources for hardened steel plate. The ones I have were called by my metal fabricator buddy as AR plate. This is steel that has been hardened to 500+ Brinell. Normal tools can't touch this stuff but then again, neither can bullets. I used to work in a place that had quite a few military contracts. One day the project enginner came down and showed me a piece of bulletproof steel. I gladly informed him that there was no such thing. He gladly bet me $5 that I couldn't shoot through it. I accepted as I had some AP in 30-06 and a Garand to shoot it . AP didn't smudge this stuff. .300 Weatherby shooting solids couldn't scratch it. I contemplated burning a hole so as to preserve whatever credibility I had, but couldn't/wouldn't do it. So I finally bought some Remington Accelarators and shot 5 holes in the damn thing. Not bad! It only cost me $22 to win 5 and I still had 15 rounds.
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Old 10-31-2005, 05:32 PM   #8
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Well, I ended up with some LC API 7.62x51 Silver tips. Guess I will put them away for collectability. I sure the temptation will be to much to last that long!
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Old 11-01-2005, 12:13 AM   #9
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Well, I have considered checking with steel suppliers for hardened plate, but I was considering where the point is that the plate would be so hard that it would be brittle, and shatter when hit by a bullet (I know hardened tool steel is easy to break... I have broke plenty of drill bits), and wondering what type of alloy would offer the right mix of hardness and toughness to make good armor plate. I hate to start calling steel suppliers and asking for bullet proof plate - in todays world they are likely to be hoplophobes and think such a customer has to be a terrorist or something, which could be inconvienant.
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Old 11-01-2005, 10:54 AM   #10
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MGM Targets makes some awesome targets.From their site"To put hardness into perspective, please consider the following:

Mild Steel (like I-beams, angle iron, channel, pipe is 112-163 Brinell.
T-1 (ASTM A514) which has been the target steel of choice for years, has a Brinell hardness of 235-293. All our standard targets are targets are 500 Brinell (460-540). This converts to roughly a 52 on the Rockwell scale.
ARMOR PLATE is 500 Brinell, and has been Ballistically tested and certified. "
Tricon Metals, http://www.triconmetals.com/Inv_plate.html ,supplies 500 brinell steel plate.
AMTANK Armor, http://www.amtank.com/armor.shtml , does work for the military but is a private company and their site say's they'll do prototypes and small runs.
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Old 11-01-2005, 11:44 AM   #11
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Thanks Mad Bodhi, I will check locally for some ASTM A514, and look into that tricon 500.
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Old 11-04-2005, 08:42 PM   #12
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Good info

We use T-1 Steel plate for our 50 foot indoor pistol/rifle range
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