Howdy,
No offense but why would you want to pay $45 for half assed loads. If you want an '06 get an '06. Sounds like another gimmick. I mean isn't the point of having an ultra mag to have a beast of a cannon? Kinda like putting a V6 in a corvette if you ask me. If you want less powerful loads for practice, you would be better off buying a "lesser" rifle(maybe a .22LR or .223) or reloading your own. I prefer to practice with the same rifle/load/set up I plan on hunting with, that way there are less variables in the equation and I know what we can do.