20mm Proof projectile. Hispano or vulcan ?

[orpheus72]

I've got a Proof projectile today, and it came in a 20x102 vulcan case.

The projectile is a Proof projectile with tracer cavity, and a copper drive belt. No markings are present.

After examining the projectile more closely, i noticed the crimping groove looks more like those of a 20x110 Hispano than a 20x102 vulcan.

I placed a regular M55 projectile next to the proof round for comparisation. (i don't have a 20x110 projectile to compare)
I also made a picture of a 20x110 hispano case and both projectiles.

The proof round seems to line up with the crimping groove of the 20x110 case; the M55 does not...

So if anyone can help me determine if it's a 20x102 or a 20x110 (and its origin if known) it would be great...

Thanks.

 

[smle2009]

I agree,it looks more like a Hispano projectile to me,the only help I can offer is that it is not a British Hispano proof projectile as ordinary ball/practice projectile were used....however I seem to remember seeing something like this used for plate testing by the Navy?

Tony

 

[smle2009]

Found it http://www.bocn.co.uk/vbforum/threads/87998-British-20mm-Experimental-Projectiles

 

[orpheus72]

Hi Tony,

The one in your link is pretty close, but mine has a hollow point, and a tracer.
Also the length 1.93" (instead of 2.118") and diameter 0.776 (instad of 0.782) are off. Only the driveband and the distance from the driveband to the crimping groove are the same...

Thanks.