re: #40 lawhawk

It’s used in the M-230 chain gun or the MK44/M242 Bushmaster (widely found across multiple vehicle platforms (on vehicles, boats, etc.).

The M-230 chain gun uses a 30x113mm round (found on the AH-64 Apache attack helicopter), while the Mk44 Bushmaster & GAU-8 Avenger use a 30x173mm round
The M242 Bushmaster is a 25x137mm cannon