I have been doing a lot of reading on here for a long time, but decided it was time to make the first post! I am looking to buy a new big game rifle that will be used primarily for elk, deer, and antelope hunting. My goal is to get a very flat-shooting gun that I can kill confidently with at 500 yards, possibly a little more once I get comfortable with it. Having said that, I am trying to decide between the 300 Win Mag, 7mm Ultra Mag, or the 300 Ultra Mag. I could be swayed towards another caliber as well (7 Mag, 300 WSM, etc), but these seem to be the best choices that I have seen. I am just looking for any and all opinions as to why you would choose one over the other. One thing that I have already been contemplating is the ease of finding ammo and/or reloading components for the 300 Win versus either of the Ultra Mags. Any other positives or negatives about one or the other would be appreciated!