RE: 270 or 300
I would agree with all of those that prefer the .270, especially for beginners. (Which is not to say that the .270 is not also great for experienced hunters.) The .270 is provided in nearly any action rifle, will generally be lighter than an equivalent .300 Magnum, will be considerably less expensive to shoot, (allows more practice for the same money), recoil is much less severe, and with heavier-premium bullets will suffice for any game in the lower 48, (and most in other parts of the world as well)! It is a cartridge that does many things well and is easy to find ammo for. It' s also one of the most popular cartridges world wide....which speaks to how well most think of it!
Good luck and many successes!