Yes, very believable! My first 4" Kit gun which I owned when was 16 would shoot groups from a rest all day long which varied from 1/2-1" at 25 yards. I wasn't guessing, it was on the Omaha Police range. Best shooting .22 revolver I ever have owned! Foolishly traded if for something else about 2 years later thinking they would all shoot this well and it could be replaced!
I have had a couple of K-22s that will shoot around 1 1/4", sometimes a bit smaller, at 25 yds, but then the eyes were far better 55+ years ago. These days I feel fairly good with 3-4" with the same guns!