Barnes Bullets Varmin-A-Tor 22 Caliber .224 Diameter 50 Grain Hollow Point Flat Base 100 Count by BARNES BULLETS ACCURATE – EXPLOSIVE – LEAD CORE. Back by popular demand and featuring the explosive DETON-A-TOR™ core. This lead-core classic hollow point design utilizes a scored nose cavity. A thin and tapered copper jacket fragments violently on impact vaporizing any varmint in its path. Sectional Density 0.142 Ballistic Coefficient 0.192