Our .22s at the range we cleaned once a year. Most of them were cil 180/190. They would get shot maybe 100-120 rounds a week, and when we cleaned them they would still be punching Xs at 20 yards, so was it necessary? Many of our guns were purchased back in the early 1970s and still work great to this day. We always used target ammo. Having said that, I have used lightning ammo that lead fouled something terrible and wasn't sure if it was the ammo itself or the leading that caused the accuracy to go to the wayside, but I haven't shot cheap ammo in a long time.
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