I was going to say Cooper or find a used Kimber, but that's been covered. However, you can usually pick up and rebarrel a .223 bolt action cheaper than either. I built one because CO state regs require 6mm or larger diameter bullets, if you don't have similar regs then I'd build/buy a fast twist .223 Rem.
You might look at a rifle in 6 ARC or 6.5 Grendel. There are far more factory offerings from a few manufacturers. I will say that the 6X45 is a fun, and versatile rifle just make sure to use at least a 1:8 twist.
