M40A5 <3 I haven't unlocked the GOL Magnum yet, but I've heard it's a monster. My buddy has one and he wrecks with it, and he only started sniping/recon last week. He played BF3, but he was Support 90% of the time, and a Damn clever one at that despite that he almost never played.
If I had to pick another, I'd pick the CS5. Once you get used to the slow bullet velocity, it can do some serious damage. Plus it looks like a bit like the "Plasma Gun" sniper rifle from Lost Planet 2, my favorite weapon from my favorite multiplayer game of all time.
PSN Chivers-Mura Steam Muramusa723 "Winning is teaching, losing is learning." - Ray Lussier
Yea, the CS5 is another good choice for mid range sniping but you have to get used to it.
It has the same guaranteed headshot kill as the GOL, a faster bolt rechamber. faster reload, a larger magazine, and tighter hipfire. In return the CS5 has a slower bullet velocity and what seems like more bullet drop which might make this more appealing for the skilled sniper. However be prepared for more difficult shots at range and with moving targets.