Wow this could get technical fast. It boils down to be able to use heavier grain bullets in the 30 cal as compared to 7mm. Both will take all of the game you mentioned with plenty to spare as long as you use the proper bullets. The 7mm will shoot a little flatter at longer distances especially when using light for caliber bullets. Essentially it comes down to do you want to use a 7mm or 30 cal.