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405 SPOTTER (10mm XM75)

Frankford Arsenal started the development of a new shoulder-fired 90mm recoilless rifle in 1957, the PAT (Platoon Anti-Tank, which was to use a spotting pistol incorporated into the forward grip. Initial testing was done with a scaled down .50 Cal spotter-tracer in a modified .30 Service case (.30-06) but results were not encouraging and a .405 (10mm) bullet was designed. In early 1958 Frankford Arsenal assigned the designation FAT72 to a .405 cal spotter cartridge. These were loaded initially with an inert TAT-82 spotter tracer bullet with no markings for ballistic testing. An additional lot was loaded with yellow/red tips.