Analysis of information sources in references of the Wikipedia article "Caseless ammunition" in English language version.
40mm CL
The Japanese made an interesting attempt to improve the firepower of the Ki-44 by installing the 40 mm Ho-301 cannon, firing caseless ammunition. But the 245 m/s muzzle velocity of these weapons was far too low, and they failed in combat. Not many of these Ki-44-IIc aircraft were built.
40mm CL