Assault weapons rounds have up to 4x the muzzle velocity of a handgun round.

Peter M. Rhee et al., “Gunshot Wounds: A Review of Ballistics, Bullets, Weapons, and Myths,” Journal of Trauma and Acute Care Surgery 80, no. 6 (June 2016): 853–67, https://doi.org/10.1097/TA.0000000000001037.