General > Discussion
SMG ammo description
Voller:
I would say the picture on wikipedia says it all: aluminium on the outside, then comes the hard steel shell to do the penetrating, then comes the charge and fuse.
The softer material on the outside is to make sure that the barrel of the gun firing it doesn't get damaged in the process.
Stalins Organ:
--- Quote from: "Winter" ---
Quoting from Wikipedia:
"The SS190 AP ball FMJ is designated as Armor Piercing (AP) ammunition, designed to penetrate body armor. Its sale to civilians is restricted. The SS190 bullet has a steel penetrator and an aluminum core."
We do our research before we write things down. :P
--- End quote ---
Good to hear.
Looks like it was just a difference in interpretation - seperated by a common language.
A cross section of the SS190:
As you can see the steel bit is the tip, backed by an aluminium body. this gives the ligtest possible projectile (high velocity) with a hard tip (superior penetration).
To me that would be described as a "steel penetrator on an aluminium projectile", rather than an aluminium "core", which implies the middle is aluminium.
But at least you spell "aluminium" correctly!! :lol:
Cheers
Damp Squib:
--- Quote from: "breversa" ---Deformation usually goes against penetration, so I'm also puzzled as to why an aluminum core instead of a steel one. Is there any metal specialist here who could tell us the compared caracteristics of steel and aluminum (hardness, density, etc) ?
--- End quote ---
Aluminium is used to make the bullet longer than if the traditional material, lead, had been used.
The intension is that the bullet destabilises in flesh tumbling sideways cutting a wide slot instead of poking a small hole. If the bullet had been shorter, the slot cut would be less wide, and less damaging.
--
DS
Stalins Organ:
I don't know about the length issue, although it is certainly of prime importance in ballistics, but http://www.d3lf.net/p90/ammo.htm says that the role of the aluminium body behind the tip is to tumble after penetration, and that this is achieved by it's greater weight than the steel tip, which seems odd since the all-lead SS193 subsonic round is exactly the same length (it is also cross sectioned on that page).
I suspect the effect occurs because the 2 parts are not joined, other than being enclosed in the jacket, but tha't just supposition and I don't know any details on how it would happen.
Anyway - the net effect is that hte SS190 is supposed to ensure that there is no "over-penetration" - ie no-one behind the target gets hit with rounds that have already hit the target, or bystanders behind flimsy protection such as soft building walls do not get seriously injured by strays. All the while still assuring excellent penetration......so 2 contradictory requirements to be met - good penetration, but not too much!
Winter:
--- Quote from: "Stalins Organ" ---
As you can see the steel bit is the tip, backed by an aluminium body. this gives the ligtest possible projectile (high velocity) with a hard tip (superior penetration).
To me that would be described as a "steel penetrator on an aluminium projectile", rather than an aluminium "core", which implies the middle is aluminium.
--- End quote ---
No, I don't think you're interpreting it quite rightly. It's the bullet that has a steel penetrator and an aluminium core, which -- as you can see in the cross-section -- it does.
I may have worded it a bit poorly in the article, though. Will have a look at it.
Regards,
Winter
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