.First thing I would do is to have a reputable gunsmith make sure the gun is able to handle your vintage ammo. With the unique cam and roller breech locking system the ‘moving parts’ have to be up to spec. and if not the gun will easily jam or worst. That’s why It was only produced for two years and had limited use in the field.
Very unique gun, fun to shoot, but rarely goes to the range with me. I have two of them: a 9mm and a 7.62x.25.
Be safe!!