20mm Projectile ID please

[hicky1300]

Found this amongst odds & sods & thought it was just another 20mm Vulcan TP Proj?
Steel body & alloy nose but the drive band has this strange profile I have not seen before.
Thoughts? ID & cart it goes with please.

 

[US-Subs]

Something for the Stealth Fighter maybe?

 

[hicky1300]

Dooh!! Managed to uncloak it!!

 

[SG500]

Looks like its been fired then the band turned down on a lathe to make it look like its not been fired..........the band doesn't protrude much above the main body so wouldn't engage much rifling as it is.

Dave.

 

[Tony Williams]

The nose shape and the position of the nosecap/body join look to me like a PGU-28, which has been the US standard ammo in the M61 aircraft gun since the 1980s.

 

[hicky1300]

I thought it was a Vulcan projectile but after comparing it to the others in my collection the shape is different & the nose is longer
I know what is meant about the drive band & considered this but theres none of the usual tell tales/damage (apart from rifling marks ) it has been fired
If it has been turned then it was a very good job. The drive band does still protrude above the body

 

[hicky1300]

OK - bit confused now. This proj is not for a PGU-28 round as it is too long & the profile is wrong although the nose length does match some. I have looked at my 20 x 110USN rounds & the proj is the right length but the dimensions for the drive band and the machining of it do not match?!
Picture shows all my 20 x 102`s with the two 20 x 110`s I have. The rogue proj is the loose one

 

[kahu1]

Looks like a 20mm x110USN API proj,(MK13)with a turned down fired DB,this is squeezed downward on firing.
The ridge above the DB is the AP core sheath.
Note; your 20mmUSN rounds are in the HS820 link,the correct link (mod2) is more like the vulcan type,with different spacing.
And the black proj. is wrong for the USN case.

Bob

 

[hicky1300]

Thanks for that Bob
I knew about the M99 Proj - just hadn`t put it in the correct case!
Links were just to get them together & out of the way. Need the correct links