Most of the population are right handed, so we can assume that right handed pistol shooters hold the pistol with there right hand, what hand are you going to use to open the bolt and load the pistol?
Or are you one of those who after a shot move the pistol from your right hand to your left, then use your right hand to load? .... If you are then you need to practice loading with your left hand, in a comp every time you change your grip you change the impact point of your pellet.
I have shot in county comps (some years ago now
) and I know that just changing how tightly I hold on to the pistol changes the impact point.