Practice and form.Pay special attention to how the gun feels in your hands right before you start your trigger pull.Are you squeezing the grip?Letting it just sit?Are your arms locked?Or just one?I have found a very little detail can change point of impact.For instance if I grip my gun then cock it then pull my trigger finger out and prepare to shoot my point of impact is different than if I never put my trigger finger down on my grip and just keep it propped right below the cylinder on the frame.Just something to think about.

"If you get to thinkin' you're a person of some influence,try orderin' someone else's dog around" unknown cowboy