I would say for the lighter bullets go with a smaller case cap, the Lapua holds a lot of powder, as does the 7mm Rum. The large cases work the best with slower powders and heavy bullets. A 280 AI will push the light bullets very nice! Brass is cheap, dont need a special action. 2nd on my list would be the 7WSM, neat little round.
Lazzeroni....nope! A guy i know just had to have one, bragged about what it would do, well lets just say it ain't close to what is posted on their website. The 7 Rum will prolly out do it and for lots less $$$.