Have you tried any other brands of ammo?
Could be that your gun just doesn't like the Super X, or perhaps the particular projectile loaded into it.
Winchester Super X wasn't particularly flash in my 223 Tikka, probably around an inch at 100 yards, but Federal and Hornady shot very well.
I have two set's of Warne rings and have had no trouble from either, and they seem to be highly praised in the USA.
Could also check the action screws, if they were loose could cause problems.
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