Many of my friends travel around the states hunting everything the USA has to offer (big Game). Currently I have a .270 which works just fine for me in New York foe deer. I want a rifle that will take down anything I feel like hunting. I know that a .270 is capable of this with perfect shot placement but I am not perfect. I am considering 7mm remmag, 7mm wsm, 30.06, 300 winmag, 300wsm, 45.70, 450 marlin. What are the differences between the regular mags and the short mags besides the actions. Also I would consider buying an extra barrel for my Savage 111, I know that a 30.06 barrel would work are there any others. Any help would be great. I am kinda leaning towards a 7mm rem mag. What do you guys think. Cheers