I've been shooting the 264 win for over 20 years. It is the only rifle I used for deer, I was forced to shoot a 270 one year and couldn't wait to get my mag back. Pound for pound I will put a 264 up against any deer rifle on the market. I hear people brag about their 7mags and 308's and I think... it's a deer not a cape buffalo, who cares. Point is you have a great weapon in the 264. It's not the flattest shooter by any stretch but once you learn your ballistics and drops, your a killer from 400+ yards. I have personally fliped whitetails at 250 yards and sliced a turkey's head smoothe off at 377 yards with this gun (luckiest shot I ever made). Get a Barnes reloading bible, it is a little pricey but it's well worth it. It has all the ballistics for their rounds and if I remember serveral competators rounds. I shoot a 150gr barnes triple shock 100% copper bullet, this after shooting the "stock" 140 gr remmingtons for years, don't even bother with the winchesters, they'll dissapoint you. Ballistics wise, I am comp. with my buddy's rem. 308 bull barrel, he's a touch faster and a little flatter but he paid a grand for that gun and in the end at 400yards I have more knock down. I wouldn't trade my 40 something year old win mag for any other caliber deer rifle on the market, period.
P.S. don't cut costs on the scope, pay now or double later. I shot once with a brand new bushnell and blew the recticles all over the place. Took it back and had a vari-IV 6.5/20/40 leupold monted on it and have been keeping everything with-in 1/2" @100yd (no bench rest)