A .30-06 is considered by many to be the maximum recoil that a normal person can tolerate without adverse effects, ie developing bad shooting habits. The three most popular rounds for bolt action rifles are .243, .308, and .30-06. Any place that sells ammo will have these calibers. A .270 is just a .30-06 cartridge with a lighter and smaller diameter bullet in it. If you want it, get it. My nephew recently got a new rifle and it is .270. It will kill deer and slightly larger animals. If you want a long action rifle that shoots a bullet that is faster than a .30-06, then go for it.