shot a 270 with a fixed 4 power scope for over 25 years. I don't recommend the 4x scope part! Any decent scope will do, 3x9, whatever. Just get one and practice. Accuracy and bullet placement is really all that matters. Truckloads of antelope, deer, a few elk, etc, with the 270. Everything hit right died right there. I used non-premium Remington 130 grain core lokt bullets for everything and wouldn't have changed weights if I'd drawn a moose. Zero (0) bullet failures.
I sometimes walked rifle aisles and was drawn close to UltraLaserDeathRayBlasterMagnumExpress rifles but quickly went back to the 270, apologized for being tempted and we settled down again.