A curiosity from the 1930’s. Senator Clark and Mr. Casey from the Du Pont Co.
It seems that the Du Pont Co. tried to make .303 incendiary bullets by reforming .30 caliber bullets from Frankford Arsenal.
Source: Hearings before the special commitee investigating the munitions industry, United States Senate, seventy-third congress, pursuant to S. Res. 206, a resolution to make certain investigations concerning the manufacture and sale of arms and another war munitions. 1934.