I don't have a Norma, but do run a 35 Newton, pretty similar in case space and powders as well and RL17 has been very good for me. I get 2810FPS with the 250 PT and 2960 with the 225 AB's. I ran some starter loads with the 270 grain Northfork as well and those went 2650. The big 35's are impressive cartridges.
Good luck, I would imagine anything 4350 like would work very well for you.
What are you using for cases to form from? I've got a .35 cal barrel burning a hole in my safe. Was leaning towards the Norma, but a Newton would be neat.
