Cleaning Thoroughly, lubing properly, some moly on pressure points and cycle the bolt several hundred times. I had a couple of bolts that dragged a lot. On one a respected old timer that offered me a lot of advice over the years recommended a bit of ultra bright toothpaste in key areas and a few hundred cycles. That did the trick on that one. Another I had to polish the daylights on the bolt body until I could see myself in it. the actual bolt body was parkerized or some thing like that and it was just too tight in the receiver. That did the job on that one. So there are several methods depending on your issues with the individual rifle.
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