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I haven't built one on that action (yet ), but did get to look closely at one and talk to a smith that was using it for a customer. He stated that there are decent but need alot of "finishing" to make them smooth and asthetically pleasing. They are a heavy action so maybe not the greatest for a light weight build.
I played with a Montana rifle at the gunshow this past weekend. I didn't like it. it looked solid enough, but the bolt was sticky and it would bind more often than not.