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Posted: 1/1/2012 4:56:20 PM EDT
Been doing searches on it and don't fully understand how it work when it impacts?
Link Posted: 1/1/2012 7:30:19 PM EDT
The API bullets that I've been using in my 50 BMG weigh about 647 grains and are a copper/brass jacket with about a .40 caliber steel penetrator inside it. Between the steel penetrator and the jacket is a powder that flashes when it strikes a hard surface traveling at a high rate of speed IE 2000 FPS or more (my Guess) I did cut one open and the powder just pours out and when you touch a fire to it, it acts just like flash powder. Poof and you can't see for a few seconds along with a puff of smoke. When I shoot my 7/8" thick gong it punches a .40 caliber hole straight through it as the copper/brass melts/gets knocked off and the steel penetrator just punches it's way right on through. As it does that it makes a flash and a puff of smoke and leaves a black mark on the face of the gong. Hope that helps you. They are really quite simple and not near as fancy as the Rafous rounds. They are also a whole lot cheaper but not very accurate. Especially when they are pulled GI bullets.
Link Posted: 1/1/2012 11:58:06 PM EDT
Originally Posted By Tommy2399:
Been doing searches on it and don't fully understand how it work when it impacts?


As was said above, there's about 20 grains of grey/silvery flash powder in the nose of the bullet between the copper jacket and tungsten carbide .428" (if I remember) diameter AP core. There is also a lead (pb) plug behind the core.

I have never really played with the powder, beyond burning some, I assume its pressure sensitive. I've seen some sub sonic api rounds (510 whisper) ignite so it doesn't have to be going too fast. None the less, when they hit relatively hard objects (not much is "soft" at 1000-2800 fps), the jacket crushes on impact and the core pushes into and ignites the flash powder. Get between an 8 and 20" diameter ball of fire, just for a flash.
Link Posted: 1/2/2012 11:37:24 AM EDT
How much more compound do the blue tip M1s have? Seems like its noticeable.
Link Posted: 1/2/2012 2:57:14 PM EDT
[Last Edit: 1/2/2012 3:01:11 PM EDT by rg1]
15 grains of incendiary mix in silver tips versus 34 grains in the blue tips. Incendiary mix is called IM-11.
Link Posted: 1/4/2012 4:49:38 AM EDT

Originally Posted By LedZeppelin:
Originally Posted By Tommy2399:
Been doing searches on it and don't fully understand how it work when it impacts?


As was said above, there's about 20 grains of grey/silvery flash powder in the nose of the bullet between the copper jacket and tungsten carbide .428" (if I remember) diameter AP core. There is also a lead (pb) plug behind the core.

I have never really played with the powder, beyond burning some, I assume its pressure sensitive. I've seen some sub sonic api rounds (510 whisper) ignite so it doesn't have to be going too fast. None the less, when they hit relatively hard objects (not much is "soft" at 1000-2800 fps), the jacket crushes on impact and the core pushes into and ignites the flash powder. Get between an 8 and 20" diameter ball of fire, just for a flash.

I always thought it was steel, seeing as how regular AP is steel (see theodore gray's periodic table site. I've read it elsewhere too) but i don't really know. I just like reading about 50bmg stuff, don't own any yet, until maybe I save up some money.

someone could take one apart and test it with a magnet to really see.






Link Posted: 1/4/2012 5:23:13 AM EDT
If the tungsten carbide is cemented or bonded to steel or cobalt, it will appear magnetic. Hardness testing would be needed to determine which is which.
Link Posted: 1/4/2012 8:21:00 AM EDT
I thought the only tungsten carbide penetrator was in the MK211 and the API/AP was hardened steel.

no???
Link Posted: 1/4/2012 5:17:28 PM EDT
My fault, I thought all 50 cal APs were tungsten and 30 cals were hardened steel, turns out .50 ap, api, and apit are all hardened steel.

Sorry for the confusion. Also got the amountt of incendiary filler wrong.
Link Posted: 1/5/2012 5:15:01 AM EDT

Originally Posted By wildearp:
If the tungsten carbide is cemented or bonded to steel or cobalt, it will appear magnetic. Hardness testing would be needed to determine which is which.

forgot about this.

could do density testing too i guess.
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