22 Lr , semi once it's starts to jam 500 - 700 rounds.
22Lr , Bolt nearly never till feeding or extraction becomes an issue. 1000 rounds plus.
17HMR only once accuracy drops off , 500 rounds plus. ( it should be noted that down here in Central my rimfires are my go to rabbit rifles and I just consider them tools )
Centre fire , Always after either one shot or a couple of boxes used , once the rifle has being fired I clean before putting away..
There is a debate that too much cleaning has damaged a lot of rifles weather it's rods and brushs and even bore snakes. I only clean if I have to.
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