If your rifle has conspicous metal fouling after only ten shots, you have a very rough bore!
There are a number of techniques you can use to polish a bore yourself or you can pay a gunsmith to do it for you.
To answer your question though, I myself do not clean the bore through hunting season beyond running a patch through occasionally if it gets wet. It makes no sense to get a rifle zeroed in with a dirty bore then scrub it out - at least to me.
In your case though (because of the fouling), I would get it zeroed in then clean it thoroughly and re-check the zero with a cold shot and shoot the rifle clean all season.
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Keith
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