How do you prove anything on the Internet?
I'm not the person to ask for those groups, I haven't and probably can't shoot anything close. I can tell you that I've seen 1.45" 5 shot groups at 183 yards. I've seen just slightly over 2" from the same man and same gun at 200 yards. It would be a false statement to say that an airgun is not accurate. I'm sure better have been shot that I have not seen, but thats still acceptable in my book.
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These groups were shot by the same man. He does a lot of testing and his postings on the airgun forums are always very nice to read.
All at 101 yards. Two are under 1/2".