I am kicking the idea around of building a custom rifle and I am really unsure about wether to go with the 7stw or 7rum. I know the velocities are similar and I am aware of the powder capacity differences. I have been having some issues in reloading the stw for accuracy. Is there an advantage in getting away from the belted magnum when accuracy is involved? Also what is the difference in brass life and things of that nature?