Faster than a bolter round

Zatori’s pupils contracted rapidly as the blindingly bright bolt of plasma lanced out of the weapon’s barrel. Though not as fast as bursts from a lasgun, plasma bolts had a far greater muzzle velocity than the bolts fired by a bolt pistol or bolter, closing the distance from weapon to target in the merest fraction of an instant. The rock outcropping vanished in a flash of searing heat and explosive shock, sending a puff of atomized flint into the air, a small black cloud that lingered a few metres over the ground.

Sons of Dorn pg. 128