I don't understand what you are saying Munksa? virtually non moving targets at point blank range it would be harder to miss.
I think I may. Jeremy had won prizes for shooting. Could mean he prided himself on being something of a marksman. Sheila wasn't, ergo, put a gun in Sheila's hands and her lack of competency would be shown by the results. JB really didn't want it to look like a competent marksman had carried out the murders. He wanted it to look like Sheila had.