What are the laws of your state? Are rifles allowed, in the area that you hunt, or even to be used in the state?
What are your preferences, per caliber?
How far is the average shot?
The .270 is a very good caliber, and a reliably accurate one as well.
Second, don't buy online, decide what you want than go buy local, where you can feel the gun, handle the gun.
Decide if the type of gun you want, whether it be semi auto, pump, bolt, lever, single shot, will fit your frame.
All the online research is for naught, if the gun you buy doesn't fit.