30x173mm Unknown

[EOD Sterling]

Hey Folks, long time.
Got a good one here, a team came across this the other day and it's a real head scratcher.
Lets see what we can do to help these kids out?

[FONT=&amp]Dimensions[/FONT]
[FONT=&amp]Projectile dia- 30mm[/FONT]
[FONT=&amp]Projectile exposed length - 105mm[/FONT]
[FONT=&amp]Total length of complete round - 279mm[/FONT]
[FONT=&amp]Potential Lot # ACN79-M006-027 (also on the case 7400730-1)[/FONT]
[FONT=&amp]Cartridge length - 173mm[/FONT][FONT=&amp]

OK folks, hit me! whatcha got?

[/FONT]

 

[Kaptainssurplus]

Supposedly a machine setup dummy for Aerojet's API production line.