SPIW why closed ?

[Avksentii]

In the 1960, USA made an investigation a program's named Spesial Purpose Individul weapon (SPIW). Within the program was developed needle-shaped bullet (Armoured Piercing Fin-Stabilised Discarding Sabot) cal. 5,45; 5,6 or other. What were the reasons for closing SPIW? I heard now is make similar bullet for cal. 20..30-mm, it's true?

 

[A Can of Man]

I think programs like these get opened and closed on a pretty regular basis. Regardless of what the official reason is, it can be anything.
Lack of technology to make it viable.
Cost to effectiveness ratio (not going to be issued to any line unit anytime soon).
Does it really improve over current options.
Overall price (too expensive to even justify very limited, specialized use).

 

[Avksentii]

Cost to effectiveness ratio (not going to be issued to any line unit anytime soon).

Maybe the reason include on war in Socialist Republic of Vietnam. Military forces urgently needed a reliable rifle, therefore they begin using a 5,45-mm NATO bullet.

I think programs like these get opened and closed on a pretty regular basis.

After all my opinion that this is very perspective idea (+with news technologies).

 

[A Can of Man]

5.54mm never became a NATO standard round.

 

[Avksentii]

Make mistakes ..... 5,56X45-mm

 

[major liability]

Sounds similar to Steyr's ACR concept. It looks like a pretty good idea, but the ammo seems like it'd cost more.

The Steyr ACR's rounds consist of a carbon steel flechette for a projectile that used a four part spindle sabot packaged in a telescoped arrangement with propellant packed around the projectile. The case of the ammunition was made of a light weight translucent plastic instead of conventional brass making the rounds weigh less then half the weigh of standard 5.56x45mm NATO ammunition.

http://en.wikipedia.org/wiki/Steyr_ACR

 

[Avksentii]

It is a bullet for Steyr ACR. Using the carbon steel flechette allow increase a "stop-effect". Because the bullet inside body is bending unlike DU-penetrator.