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I end up doing the same thing. I have to set the hop on the site and on the day and that adjusts the point of aim. The left and right setting is best done at home where there is no wind anyway and then the elevation is going to wait for that hop to be set.Turn a chair backwards then clothes peg an old tea towel to it! The cloth wraps around the BB to stop it. You occasionally get a flier but if you have garden fences that'll protect neighbours! Problem with zeroing is you really need to set the hop first (Although if you have a short garden then the hop won't really do anything anyway!)
If you're trying to zero a scope I find you need to find the rough middle setting (Normally I wind both dials full lock then count how many turns to achieve full lock the opposite direction) this is usually 8 turns, so turn the dials 4 rotations to get a sort of "Rough centre" fire a BB and correct, If you can get the Left/Right adjusted OK then you can adjust elevation on site!