What is the difference between the 22 CM and ARC? How does it compare to the 22-250? Do we have a comparison of the accuracy and reliability yet?
The CM is ballistically close to the 22-250, the ARC is more like a 223.
The ARC is significantly shorter. It was designed primarily to be used in AR-15 sized semi-auto rifles. It can be used in Bolt guns however. The CM is not going to fit into a typical AR-15. You would need an AR-10 for it, much larger.