ORIGINAL: RugerM77.270
If you are hunting the .270 is just as accurate as the .308 and 7mm. I am not real sure about it if you plan on doing some match shooting.
Here is an article from
Outdoor Life that talks about just that.
IF I were selecting a target cartridge, I'd choose the .308 Win. or the 6.5/284 Norma over a .270 Win. Just because there are hardly any match bullets in .270.
However, I used to hunt with two different Mannlicher/Schoenauer .270 carbines which both would put five rounds of either Nosler 130 or Nosler 150-grain Partition bullets into 1.25" @ 100 yards. Shooting like this, both carbines were death on anything within 350 yards. That was quite satisfactory for three years in ALASKA!
There is a Sierra 135-grain Matchking .277" bullet. That should be quite satisfactory out to 500 yards fdor any match shooting you'd want to do.
If that is too light, try a Nosler Ballistic Tip in 150 grain weight. These bullets are as good as most match bullets.