Before I went to a .300 Weatherby, I used a Browning .270 and absolutely loved it. In fact, I hunted deer with it this season. My best critters have been taken with the old O'Conner favorite. I think that O'Conner put it well when he said that if you were only hunting North American big game, a hunter has no need for anything but a .270. We can debate this one until the cows come home, but from my experience with the caliber, he is right.
I have reloaded several different bullets in this caliber. One year I reloaded some 130 grain Nosler Partitions and really liked them. I killed a five point bull at 358 yards. Hit him twice and he walked into the pines and died. Three weeks later I took a mule deer at about 283 yards. I hit the deer marginally and 5 hours later made my follow up. The bullet did its job, I just had the shakes.
The following fall I drew an elk tag and tried something new. I tried the Hornady 140 grain BTSP. I found that the factory load in this bullet shot better than my handloads. I killed a bull that I called in to about 20 yards. Not a real test of a bullet but the bull went right down.
I have also used 150 grain Nosler partitions. I have found that the heavier bullets, being the 140's and the 150's shoot more accurate out of my rifle. I think if you tinkered with some handloads you might get a fast accurate 130 grain combo.
Whatever bullet you do choose I would make sure it is a controlled expansion bullet, especially for deer and elk. I would personally stay away from the barnes X. I have tried this one and do not like the way it shoots out of my gun. The newer bullet may be good, I just don't like copper. Just my opinion on my experience.
Great Caliber, and great all around cartridge. I have had my .270 for over 12 years and consider it one of my best friends. Those who have had a rifle for a long period of time and killed a lot of animals with a particular weapon know what I mean.