As a heavy bullet fan....does that mean you buy cases twice as thick as normal for more weight too?I am a heavy bullet fan. A .257 WBTY currently in the works to primarily shoot Berger's 133. As @Hoss50 noted, it has higher BC, less drop, and higher energy at POI. If the 133 Berger propels at 3000 FPS, at 900Y = 1912 FPS and 1080 FT=LBS.