I might be reading to much into your post but the gun shoots good for a few shots when starting with a cold clean barrel then starts throwing flyers, and you have done this on multiple range trips? If this is the case have you tried to let the barrel cool completely and tried shooting again before cleaning? I'd do this to try and see if this is a barrel heat issue or a barrel fouling issue. If none of this helped I would look for a bedding problem as stated above.
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