The type of bullet that killed Charlie Kirk was fired from a bolt-action rifle, specifically an older-model imported Mauser 98 rifle chambered in .30-06 caliber. The bullet struck Kirk in the neck during the shooting at Utah Valley University. This rifle is a high-powered hunting rifle, known for its accuracy, and it was equipped with a mounted scope. The bullet casings recovered from the scene included spent shell casings from this rifle caliber.