ASH556,
Perhaps you are putting too much emphasis on sight picture at the expense of sight alignment. Are you familiar with Parallel vs. Angular distortion? Perfecting sight alignment far outweighs sight picture. The key is to ignore the wobble and fire a shot that the axis of the bore is Parallel with the desired path to the target. The wobble looks worse as the distance to the target increases but it is deceptive because the wobble does not matter if the sights are aligned. However once the sights are misaligned the error increases as the distance increases.
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Angular Shift Error: If the shooter does not observe correct aiming (maintaining the top surface of the centered front sight on a level with the top of the rear sight and equal light space on each side of the front sight) there will be few accurate shots. Most often, he locates the front sight in a different position In the rear notch. This accounts for a greater dispersion of shots on the target, since the bullets will deviate In the direction In which the front sight is positioned In the notch. This aiming error is known as angular shift error.
Parallel Shift Error: If the hold (arc of movement) is deviating In near parallel error from the center of the aiming area, the shooter should know that these deflections will not lower the score to the extent of angular shift error. Therefore, sight alignment is the most critical of the two. Thus, the accuracy of a shot depends mainly upon the shooter's ability to consistently maintain correct sight alignment. The main effort should be toward keeping your sights aligned, Holding the pistol perfectly still is desirable but It is not mandatory.
Improper. Control of sight alignment is not precise. Distinct focus on target renders sight indistinct.
Proper. Control alignment is precise. Focus limited to front sight only, renders the sights distinct and target indistinct and sight relationship can be controlled constantly.
It is imperative to maintain 'front slight point of focus" throughout the sighting and aiming of the pistol. The shooter must concentrate on maintaining the correct relationship between front and rear sight, and the point of focus must be on the front sight during the short period required to deliver the shot. If the focus is displaced forward, and the target is momentarily in clear focus, the ability of shooter to achieve correct sight alignment is jeopardized for that moment. Frequently, this is the moment that the pistol fires. A controlled, accurate shot is impossible under these conditions.
CONCENTRATION.
If the sights are incorrectly aligned, the net result is an inaccurate shot. Carelessness in obtaining correct sight alignment can usually be traced to the shooter's failure to realize its importance. Many shooters will, in the initial phase of holding, line up the sights in a perfect manner. However, as the firing progresses, and the shooter is concentrating on delivering the shot, he often loses correct sight alignment which he attained in the initial phase of his hold. Usually, when the shooter is unable to maintain a pln-point hold, his concentration on sight alignment wavers. An accurate shot is lost because the shooter is thinking of his arc of movement and not the perfection of sight alignment.