DRG,
I have no problem with the HE Kill values, they seem fine to me.
thatguy96,
The bullet is different but the case is the same.
)" This weapon fires standard 30 x 173 mm GAU-8 ammunition, using a side-stripping link developed by The Boeing Company. It can also fire RARDEN and Oerlikon KCB (30 x 170 mm) ammunition by changing the barrel, bolt and aft feed plate."
Found at,
www.navweaps.com/Weapons/WNUS_30mm_BushmasterII.htm
The USAF does not use the MK268 round, this is true. The USAF uses a DU round while the Navy doesn't. The Navy felt that they did not need the extra pen power of DU to take out the targets they expected to encounter in their battle environment.