77 gr FMJ (head stamp: NWM 67) and 68 gr FMJ (head stamp: IVI 69) loadings were made for the Stoner 63A for use by NSW in Viet Nam.

When tested from an M16A2:

77 gr FMJ: vel = 2874 f/s, pen = 19.2”, neck = 5.1”, bullet fragmented like M193

68 gr FMJ: vel = 3014 f/s, pen = 14.6”, neck = 2.8”, bullet flattened but did not fx

Bottom line--there is a lot better stuff available now.