Thompson Center SureFire Hollow Point in Mag Express Sabots. Yup, the cheapies from WMart. I believed I measured them once to be .451. They are a 230 grain bullet. I shoot them in my Accura Ver. 1 and just love the performance. The rifle places them right where I aim and then the bullet does its job! I couldn't ask for anything else; pull the trigger and fill your freezer.