Shootings large strings to test true accuracy increases the chances of shooter error and change in environmental conditions, so shooting larger numbers in your groups doesn't guarantee better statistical accuracy. If ou can eliminate these variables then of course yes the larger the group the better.
however, I agree with a few other comments. Three shot groups tells me what I need to know. I have shot 5 shot groups before if i was testing consistency, but mostly 3 shot groups tell me what I need to know.
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