Thanks for all the post and the powder clarifications. That is really usefully advice for a beginer.
I received my bullets yesterday, Oregon Trail 250g RN FP .452 .
Now all I need is primers and brass.
One more question. Do you seat all similar ( regardless of maker ) lead 250g. RN FP bullets the same OAL . Or is that a something you have to experiment with and the reason I should start with the low suggested charge ?