Any problems with the newer Ruger M77 Mark 2 rifles?

I was using Federal Sierra, High energy bla blah 200 grain something or other. Keep in mind I fired a box of 20 in a matter of about 30 minutes which may be my problem.
 
Yeah, my Ruger's real problem was that it hated fast groups from a warm barrel. Cold shots were always to initial POA. It was all of the following shots that went all over-until I freefloated it. Now it shoots a somewhat respectable warm barrel group.
 
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