My CZ52 is accurate enough to hit tennis balls 8 of 8 @ 25 yards. No, i don't have target pictures to post - because i shoot tennis balls rather than paper targets usually...and when i do shoot paper targets, i don't keep them around just to prove something to some guy on a forum later by posting videos or pics of my last shooting session. Some of the shots would be more like 30-35 yards since the ball rolls away when you hit it. That's good enough for me; i don't expect to be shooting many people @ 200 yards with my pistol anyway, that's why I have a rifle. My CZ52 doesn't need to shoot sub 1MOA groups, neither does my S&W 5906, my S&W 642, etc. etc. etc... in fact, with sight radius of 6-8 inches, I never would expect to shoot that kind of group anyway. A handgun isn't a rifle, don't expect to be able to aim it like one. Tennis ball sized groups @ 30+ yards are quite reasonable for offhand service pistol shooting.
You're free to disbelieve all you want, but your claims of going from 'touching groups' at 10 yards to "too wide to determine their size' at 20yards are indicative of user error rather than the firearm. Unless those bullets are just tumbling around and curving off into infinity, it's just not going to happen in 15yards that your groups go from touching (1/2") to "too big to measure" (18"? 20"?). Believe it or not, alot of people just shoot their guns and don't find there to be much of a point in posting youtube videos with targets just to prove to somebody somewhere (who can't shoot straight) that it's really their inability to shoot causing the problem and not the gun they are shooting. I see guys like you at the range all the time claiming pistol x or rifle Y are just inaccurate guns. Funny how other people shoot them just fine.