This is the part I have a hard time with. I like to use big bullets that go fast. I'm slowly developing loads for all my rifles using a mono. I still want a heavy bullet for my RUM however. Hammer cut a special bullet weighing 196 grains that will stabilize in a 10 twist. One of the advantages dealing with a small company. mtmuleyCharles, the only complaint I've ever had or heard performance wise is bullets not expanding enough. The key seems to be shooting light for caliber bullets to retain velocity. Your bullet stays together so fragmentation is not an issue. My '06 shoots the 150's very well.