Pepi, I fully agree with Elbert on working your way up on different loads. I'm on the far side of 70 and shoot everything up to and including Brenneke 3 inch black magic magnum 600 gr slugs from my SW. There is no issue with "aimed" shots once you get comfortable with the firearm. But suggest you also practice "hip" shots. Most people have an initial tendency to shoot high but with practice you will have no problem hitting your intended target using this technique. Practice, practice, practice!
My only recommendation is to wrap the SW grip with either tennis racket or hockey stick grip tape which you can get at any sporting goods store. It really makes a difference plus if needed you can add a couple of additional layers in the field. Particularly good if you live in wet or humid climates.
Welcome to the SW asylum.
Regards