20mm query

[SG500]

Can anyone provide any information regarding this 20mm projectile please. I don't recognise the driving band profile.
Thanks.
Dave.

 

[ThomasP]

Based on the driving band and the body aft of the driving band it looks like a projectile for the 20mm Vulcan (or another gun that uses compatible ammunition). At least it looks the same as what I recall seeing, although there were several different shapes and driving bands used over the 70 odd year life of the gun system.. The specific body shape in front of the driving band I am not familiar with, and it might be too long for the Vulcan.