Inert Belgian military experimental 7.62mm Short Proof cartridge made by FN. This very rare undocumented experimental was developed circa 1946-1950 as part of the .30" Light Rifle series which ultimately lead to the 1954 adoption of the 7.62mm NATO. The US began this experimental series by modifying commercial .300" Savage cases and it seems Belgium produced a proof cartridge as their contribution to that series. This cartridge has a tinned brass case which is 48mm long. It is loaded with a 144gn Belgian SS77 bullet. Headstamp is 'SUPER SPEED .300 SAV'
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