I shot my CZ 17hmr today at the range and I got inconsistent results at 100 and 75 yards , which suprised me since I usually get tight groups. Some of it is because wind knocked the bullets sideways, but also I wondered if it might have had to do with the fact that I had forgotten to clean out the barrel after shooting last week about 50 or 60 rounds total. What effect does not cleaning the barrel out have on different calibers, rimfire & centerfire?