mossberg835283514....

for shots under 300yds you don't need a magnum. especially you don't need a ultra magnum. i have seen tons apon tons of new ultra mags that are on shelves with only a box of rounds through them because of recoil.
there are better calibers out there that would suffice and be alot easier on your wallet.
if you like 30caliber rounds. go with the 30-06sprg. but if you had to pick between the two i would go with the 300WSM.