Project SALVO began in 1951 as a way to increase hit probability in combat, based around flechettes as well as multiple projectiles in 1 round of ammunition.

In this video we test the nearly adopted M198 Duplex Ball, a 7.61x51 round that sends two projectiles downrange, with intentional dispersion, per round fired. This round was actually used in the field for a short duration of time before ultimately Project SALVO was ended with the adaptation of the M16 and 5.56.

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