Hmm very interesting question.
For me, there aren't many guns that I don't shoot well.
I've had great results from: In 9mm of course...
Glock 17 - I can make a glock damn near sing in my hands
Sti Spartan - More accurate than the glock
CZ 85 Combat - Very good
Beretta 92 - Can shoot just about as well as the glock, trigger pull is too long though
Bad Results:
Sig p 226 - After changing springs, polishing triggers etc. gave up, really don't like them, when ever I drew one from a holster it came up tilted, never fit me right and I have mittens that completely swallow big guns.
That's it really, most others that I have tried have worked well, a few are inherently less accurate, but I digress.
Proper technique can compensate for a poor gun, but only to an extent, but for this 'extent' to be revealed it has to be extreme situations ie long distance or very tight groups.
An excellent gun in poor hands will yield poor results, coming from a clay shooting background, I see many people trying to buy scores, but have their behinds handed to them by experience and reasonable quality.
A great gun in great hands is like a match made in heaven. A gun with a good bore axis, a good quality barrel, good fit in the hand, good trigger pull for both weight and break, shooting good ammunition makes accurate shooting so much easier and requires less effort for the consummate shooter, allowing him/her to continue their performance for longer periods of time.
I think I said too much, sorry.
