6.5 Wby RPM Weatherby Select 140gr InterlockWeatherby Select 6. 5 WBY RPM (Rebated Precision Magnum) 140gr Hornady InterLock. The RPMs large body diameter and 35 degree shoulder deliver high velocity and flat trajectory from a short action platform. The InterLock ring keeps core and jacket together for controlled expansion and deep penetration on mule deer, elk, and antelope. Norma brass, non corrosive. 20 rounds per box. Caliber: 6. 5 WBY RPM Bullet: 140gr Hornady InterLock Norma brass 20