When I changed from a 5" gun to a 6" gun for USPSA competition, I noticed that it was easier to shoot accurately, but the new gun also had a lot of bells and whistles that the 5" gun didn't, so it's apples and oranges. Since the scoring system rewards speed as well accuracy, I can say with certainty that I could score more points in a given amount of time with the longer barrel, but no idea how that would translate into pure accuracy at distance.
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