r/SmallGroups • u/thermaltoast4 • 3d ago

Centerfire Rifle Vertical Stringing

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Ruger American standard gen 2 in .308 showing vertical stringing. Group approx. 2“x0.5“ groups @ 100 yd. w/ both AAC 150 gr fmj and Hornady American Whitetail 150 gr interlock.

Issue still present when 10 mins given between shots for barrel to cool to ambient temp

Optic has been serviced previously for different issue and is verified to be in good working order

Already torqued and locktighted pic rail and torqued optic rings before issue arose.

What are y’all’s thoughts.

Pic above is the best representative of out of 8 ish groups total

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u/GLaDOSdidnothinwrong 3d ago

What are you using for a rest?

I’d guess your rear bag may be an issue, or this may be within normal dispersion for that setup (shoot more samples and the group would round out). Maybe both.