The 270 Win is a great elk round. Easy to shoot, and comes in a lighter rifle (which for me is a huge benifit when humping the mountains).
I'd go with the 150 gran bullet though. The Berger 150 (VLD) is a nice flat shooting round and gets real nasy when it hits something like the heart lung area of an elk.
If you don't reload just about any good quality 150 grn. factory load will work.
You blow up the lungs and it wont go far.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071