Its it's own distinct caliber. Designed by FN, only FN pistols and submachineguns use it. Fairly new and expensive to buy, but almost no recoil and very high penetration. Its equivalent to .224.

It came out in 94, and can reach velocities in excess of 2300 FPS

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1976 300D
190,000 Miles
Colorado Beige

1975 300D
Parts Car
78,000 Miles
Rustbucket
Also Colorado Beige

1984 190D 2.2 (Dad's)
156,000 miles
Champagne Metallic Clearcoat