223 Mkv

| Feature | Standard .223 Remington | .223 MKV (Wildcat) | | :--- | :--- | :--- | | | 1.760 inches | 1.780 - 1.800 inches | | Shoulder Angle | 23 degrees | 30 - 35 degrees | | Neck Length | Standard (0.200") | Extended (0.250"+) | | Pressure Max | 55,000 psi | 68,000 psi (estimated) | | Primer Pocket | Small Rifle | Small Rifle Magnum / Reinforced |

The "V" in MKV is often argued to stand for: 223 mkv