Jim's actions have a brazed on bolt handle. I wanted a one piece bolt- they are stronger and give me more peace of mind when I travel somewhere for an expensive hunt. I don't baby my stuff. I think Jim's actions are great but in a hunting rifle that will see saddle scabbards, cliff faces etc. I wanted something a little more bullet proof. If I were building a rifle that was not to see a scabbard or not be carried down cliffs, I would absolutely have no qualms about using a Rimrock action. In fact, I tried to buy one from him earlier this year but his delivery time was excessive on CM actions and he now uses 416 SS for his actions. I would have probably bought one if it had 17-4 SS. Instead, I ordered a Pierce action. (long story)