Vertical stringing cause?

[daveboy]

Just an update: I checked everything mentioned in your replies. I did loosen and then retighten the action screws, bring sure to get the front screw really tight, but the back one just nice and snug. I took it to the range again and tested several different handloads. My best group was no bigger than a fist. So, I know it's accurate. I loaded some more of that handload and looking forward to tweaking that rear-sight and get it centered. Thanks for your help.

P.S. Part of me wonders whether or not my front bag might have been touching the barrel and that caused the stringing. You wouldn't think so, but with a carbine, being in a hurry, sun beating on me, etc., who knows?

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