The problem with Ruger is once in a while they farm out their barrel production to some other firms. I have had a .243,257.44mag lever and a 270 that were the same situation that you have. Terrible accuracy. I have a 44 mag deerfield and a mod 77 in 308 that are outstanding. The is a definate difference between how these two groups, barrels are inside. The first group had chatter marks on the inside of their barrels. The second group did not. I hope you find a solution to your problem.
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