I'm planing to load the 450 gr A-Frame for my Brno zkk 602 in 458 lott. I've only access to norma powders, mainly norma 201 and 202. I have looked at the max loads for the same bullet in the 458 wm and thinking about using them as starting loads. The max is 75gr of each powder. Have any of you tried this bullet with norma powder? And what kind of velocity can I expect? 2300-2400fps?