I have an FCXP3 with a heavy barrel in 300WM, but that's a lot of powder to burn for target shooting. For targets and deer sized game I'd stick to 308. 45 grains of powder as opposed to 75 grains. All to punch a hole in paper.
I do not want to sound impertinent, but from the questions you're asking, I gather you don't have a great deal of experience with shooting.
What you intend to use the rifle for, the distances, your budget, and your ability/desire to re-load all make a huge difference in the choice of a rifle.
223's make lousy hunting rifles. 308's make poor varmint rifles.
Also, all factory rifles shoot the same and anyone that tells you otherwise is touting absolute nonsense. A factor rifle with factory ammunition and a shooter that knows what he is doing can produce groups around 1MOA. Sometime larger, sometimes smaller. Count on nothing else no matter what the brand.