12.7x99 (.50 Brg) ID request - explosive?

Hst is from FN

hello
yes it an HEI bullet
FN made HEI bullets in several shapes (cylindrical like yours ,and with more conventional profile)

edit:i forgot ,you can find these 12.7 rounds with HEI projectiles mounted on cases 93mm lenght (maybe for "accept the belt of the bullet)

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