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For me it depends on what gun it is, and what its intended use is.
For my hunting guns, If ive got loads worked up already, Ill only shoot 3 at a time, then ill clean it and let it cool good, 99% of my hunting shots are from a cold clean bore so thats the way i sight it in.
My long range gun, (bolt gun) I just finished testing loads for and sighting in yesterday, is a differnt story. Ill pry end up shooting 10-15+ rounds though this pretty fast in a shoot, at each stage, so thats the way i worked up loads, On my final sight in yesterday, I zeroed 5 shots at 100 starting with a cold bore, then went right to 200, with 5 shots, then 5 at 300. I had dope charts set so all my adjustments for 200 and 300 were spot on. When done, I went back to 100 to check hot barrel shots, then the same at 200 and 300. I rotated 100-200-300 untill I had 7 rounds left, went to the 300 yard mark and shot a sub 3 inch group with the last 7 shots at 300. I figure shots were about 10-15seconds apart and shot 60 rounds. My next trip out with this ill shoot 1 cold bore shot at 200 and 300 just to check cold bore differance vrs some heat in the barrel.
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