In 1951, tests were done at Frankford Arsenal with British .280 cal bullets that were supplied by ROF Radway Green using Cal .30 Light Rifle FAT 1E1 cases necked down to verify the performance of the British bullets.  The first specimen was loaded with the 140gr. Ball Type – B bullet with mild steel core and green tip. The second specimen was loaded with the British GP Ball with zinc plated FMJ.