Im lookin to buy a good all round caliber that would be good for deer, elk,moose, bear etc.
Seriously.....the old .30-06 fits your needs well. There are a few others also and they include the .280 Remington and the 7 MM Rem Mag.
You could also look to the 7-08 Rem and the .338-06 but as previously stated.....once you have a .30-06 you're set for all the worlds big game less the dangerous stuff like elephants, cape buffalo and Rhino.
The .30-06 (and if you're a handloader it don't get any better than the .30-06) is still the one that gets it done. It's that good!!!!