Hi John,
22LR rifles like to be a bit dirty to shoot well. I find after cleaning mine can take about 10-20 shots before the accuracy comes back to "normal". When testing ammo make sure you shoot a mag or two before going for an "accuracy" group. This is also true when you swap between ammos - to coat the bore in the new ammo's lube you'll want to shoot a mag or two before shooting a group for "accuracy".
I personally find the Norma Tac-22 ammo to be excellent (particularly when you add on price and supply reliability).
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