I too find it hard to believe that the ammo is the culprit. I also agree get a box of remington 130 gr corelocks and try to re-zero it. If the same erratic pattern happens then something with the scope is the prime canidate. I've only had 1 scope failure and it was a Tasco on my TC firehawk last season and acted just like you have described, all over the place shots... and then finally the crosshairs moved. If the rifle was zeroed prior then I think somehow the scope got banged? Only another range session will prove that out. Good luck!
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