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Problems with 77/22!

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Last year I finally found some ammo (cci mini mags) that shot well in my gun. Groups were consistently tight and there were no flyers. Now, my gun sprays them all over. I changed scopes so that is not the problem. All mounts are tight. Has anyone heard of a barrell loosing its personality and preferring different ammo after a period of time. I just dont understand. I just ordered a bunch of new ammo which I have not tried before and hope that I can find some that will shoot well. P.S. I have tried shooting with a dirty and clean barrell, and both will not group the cci mini mags...