Several. On the 1,000yd targets, I've used 223 fast twist, 22/250 and AI fast twist, 243, 6mmAI, 25-06, 260 AI, 300RUM etc, and on the 1 mile targets, I've used 22/250 AI fast twist, 6mm varieties, 300RUM, 338's, and the 2,000 yd was 300 RUM and 338's.
Edit: Forgot my 308's, as we shot a lot of...