Chapter 5 · Competitor Equipment Rules · p.13
5.5Ammunition
All ammunition used in competition must be safe, serviceable, and appropriate for the firearm being used.
Minimum cartridge for centerfire competitions (38 Special/9X19). For competitions only in countries where common military calibers are prohibited, .380 ACP is allowed.
Rimfire firearms must be .22 Long Rifle (.22LR) only. No powderless cartridges.
No multiple-projectile or magnum loads allowed.
Any ammunition deemed unsafe or likely to damage the targets will be removed from use. Examples include, but are not limited to: Steel Jacketed, Steel core, tracer, and incendiary ammunition.
There are no minimum power factor or velocity minimums in Steel Challenge. The Pistol Carbine Divisions (PCCI/PCCO) have a maximum velocity of 1600 feet per second.