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When I go to test my loads, I start with a clean barrel, fire at least 5 fouling shots, then proceed to test. While I'm testing, I don't let the barrel get very hot or completely cool either. I try to keep it the same throughout the test. How fast I fire depends on what rifle I'm using. A varmint barreled 223 takes a lot more to heat up than a lightweight 270 does. I don't clean during a test. If I'm doing more than one test, I might clean between tests, then fire 5 more foulers. Maybe I'm just lucky, but my rifles seem to shoot better groups after a few rounds have been through the barrel.
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