The drive band and crimp grooves look identical to my 30x173mm TP projectile belonging to the CPIC (Coastal Patrol Interdiction Craft, if that is correct) gun.
I believe the gun was made by EMERLEC, but I cannot remember the gun designation off my head. Might be a good point to start researching.
Very nice projectile either way!!
I’ll need to do some more research as I’m not 100% certain, but both Maverick1112003b’s and Spaceinvader’s projectiles may be from General Electric Phase 1 GAU-8/A development. GE initially used copper driving bands when they were developing GAU-8/A ammunition, and only later did they switch to nylon bands.
Spaceinvader’s TP projectile matches loaded GE Phase 1 rounds from the Woodin Lab, both in general appearance as well as in manufacturer/lot/date stamping. The CPIC rounds in the Lab collection are a little bit lighter blue and they seem to all have RNO markings, although they are otherwise very similar.
In Historical Development Summary of Automatic Cannon Caliber Ammunition: 20-30 Millimeter, Dale Davis indicates that GE was involved in directing the development of the CPIC ammunition during the same time frame that they were working on GAU-8/A ammunition. I’m not certain whether there were any shared components between the projects.
Hopefully someone with more knowledge than me will respond, but if not I will do some more digging and see what I can come up with.
The Emerlec-30 or EX-74 was a naval mounting which had two Oerlikon KCB cannon, one each side of the gunner’s cabin. The KCB (formerly known as Hispano Suiza HS 831L) fires 30 x 170 ammo, which is much the same size and power as 30 x 173.
Ahh thank you Tony, took a shot off the top of my head with that.
I’ll have to figure out what I was thinking of then…
You are right that the Emerlec-30 was originally developed for the US CPIC, but Friedman says only a prototype was built. The Emerlec-30, in revised form, was sold to half a dozen other countries, and over 150 had been built by 1988.
Oh that is very interesting, do you know why only one prototype of the original was built?