When teaching an absolute beginner to shoot, one of the hardest things to do is to get this point across, that they should concentrate on a good sight picture and not concern themselves about where the bullet actually hits.  Beginners will see the first shot hit off center and invariably - instinctively, maybe - apply Kentucky windage to try to bring the next shot onto the center of the target.

That never works.  They don't yet have the control or even the ability to recognize the subtleties involved in a perfect sight picture so they end up chasing the shots all over the target without learning anything. It's best to teach them to repeat the proper sight picture as best they can and then analyze the resultant groups to discover their problems.

As they develop a better feel for shooting and repeat the basics, including sight picture, their groups will not only tighten up but shift and become more consistent in relation to the bull.  Then you can apply the sight changes needed, assuming the gun has adjustments for that.

Having them try to hit the bull every time before they're ready only distracts from the lesson and creates more problems.  Learning that is a big step on the way to becoming a shooter.  I don't know if you agree, but I suspect that others here who have taught will.

Stu