When you say "hold the black" on standard target - what are the black dimensions and what are the target dimensions that you are referring to?
The "black" on these targets is the 7 ring outer margin and that is roughly 7 inches across - this is a 25metre distance target.
[/QUOTE]The targets I shoot right now have 2-3/4" black. I shoot commercial 9mm 124gr ammo (same brand all the time). [/QUOTE]
Sounds like the 50 foot indoor target - the 10 is about 6/10 inch across. And of course you are extremely unlikely to get any accuracy out of the 9mm unless you are shooting a SIG p210 or one of the Sams Match M9s built for the USAMTU. Inherent accuracy in the 9mm is not there for 99.99% of commercial 9mm pistols.
[/QUOTE]As for my expectations, well, crazy me, but I expect perfection in everything I do.

My handgun shooting supposed to be my winter-shooting-indoors-waiting-for-the-shotgun/rifle-season activity, for fun and stress relief. At some point, I realized that I am getting more and more involved in where actually those rounds I send down the range are end up. It's not "clearing the head" activity for me anymore. I want one big hole at "10" at 25. [/QUOTE]
If you can do that the next question is: "Why aren't you the Olympic Champion? or at least the National Champion?" We all strive for that, but the ONLY person that I have ever seen do this was Dr Darius Young - Three time US National Civilian Pistol Champion. And even he can't do it all the time.
[/QUOTE]So, all I want to know at this point is how to achieve this "hold the black" center consistently and if my gun is capable to do so taking "ground-link" (me) out off the equation. Another very important fact to add is that I shoot a bone stock gun off the box and would prefer to keep it that way (well, may be will consider to do a trigger job on it in the future).[/QUOTE]
Well the best way to achieve that objective would be to acquire a good 22 target pistol - even a Ruger MkII with a trigger job will achieve it, but it is a LOT easier with a European match pistol.
Also practise your Zen - shooting is a "no-mind" operation once you have trained the system.
Cheers Dr Jim