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The Sheridan fired a 152mm main gun (6 inch gun). It was one of the most unique guns (cannons) in US Military history; it fired a fixed combustible cartridge.

Similiar to artillery in WWII & Vietnam, with the projo (short for projectile) rammed into the breech with a powder charge rammed in behind it, then a primer emplaced into the breech block. With one big difference, unlike the artillery piece which loaded as aforementioned, the Sheridan tank's shell was "fixed", meaning already assembled. Once fired, as with the field gun (artillery), when the breech was opened...nothing was in the gun (breech)...but smoke.

Today's M1 Abrams MBT (Main Battle Tank) fires a similar round to that of the old Vietnam era Sheridan tank, however, unlike the M551, the Abram's ejects a back cap; the Sheridan ejected nothing.

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Q: What size cannon did the M551 Sheridan use in the Vietnam War?
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