Think of Betty White.
Not recommended.
Same procedure as for smaller ones.
You will have to buy all the loads available and shoot them to find out. All weapons have a preference for certain loads. The only way to know is to shoot what is out there.
It is a collectable gun. Stay with factory normal pressure loads.
Have it checked by a gunsmith before you shoot it. If it checks out OK, then yes.
yes.
Not recommended.
You will have to buy all the loads available and shoot them at 500 yards to find out. All weapons have a preference for certain loads. The only way to know is to shoot what is out there.
10,000 full loads or so.
The Stevens 59A can shoot all size loads from #12 to slug. So in short, yes.
What it is chambered for. Shoot as many different loads and pattern.