From the Buffalo Bill Center of the West, McCracken Research Library digital collection, WRA Co. drawing collection here are several drawings of .45 ACP cartridges.
First is a WRACo. tracing of a drawing supplied by COLT and dated 1905
Next is a Frankford Arsenal drawing from 1917
Last is a drawing of a proposed .45 ACP cartridge, WRACo., dated 1917
0.45 ACP, WRA Co. 1917.pdf (925.8 KB)