My 2 cents on calibers
A couple of questions that only you can answer- and some suggestions
1. What calibers do your hunting/shooting partners shoot?
Can you say reloading! Can you say oh SHI* I forgot my ammo!
2. Are you are shooting only factory ammo?
Then stay with the common ones .308 Win, 270 Win, 30-06.
These are the ones all companies load for and these go onsale at the big stores.
3. Before you buy based on one caliber performs better at long range have you shot at paper over 300 yards away?
Three hundred yards is a LONG way and any of the 3 above perform excellent at it. Most of us really will never or should never pull the trigger on live animals at over 300 yards. The exception is out west, 300yd just doesn't feel the same as it does in the midwest.
Have fun with your choices, you really can't go wrong if you stay with the 270 you initial selection....
Karl