I have a Browning X-Bolt Hell's Canyon Long Range in 6.5 Creedmoor with a 5.5-22x56 Nightforce on top. It'll get me out to 1000 yards no problem. It's a dream to shoot medium to long range.
I added a picatinny rail, and mounted the NF on a bracketed mount so I could swap it out with my Leupold VX 2 4x.
If it were any higher caliber it would really make a mess up close, especially with the Hornady ELD-X rounds I find best for it.
The tradeoff on that round is the expansion helps at longer ranges, but really tends to bungle things up close range.
It comes default with a free floated barrel, and a muzzle brake, which really reduces kick, and allows for less hassle on subsequent shots.
If you wanted to upgrade a Remington 700 at a Gunsmith, it'd cost more than buying the browning stock. I debated buying a Remington 700 Sendero for a long time, because it's basically the Cadillac... But I went with the Browning anyhow. I had the liberty of trying a friend's 700 in 300 win mag, but it was a funny setup with an ATN Thor-HD 384 on top.
I gotta say, the number of options aftermarket for the 700 is amazing. So if you want something you can customize all day long without buying 10 different rifles, I'd go with the Remington 700.
I was just going to use mine for specifically hunting White Tail, and maybe some random varmints occasionally, and it's perfect for that.