Regarding reloads, I have only loaded two loads in my 270's over the years. One for mule deer, I went with a Sierra 130gr SPBT, the other for dark timber elk, 160 Nosler semi-PT.
Generally this is what I have observed in 270's:
130gr yields 3000fps (+/- 100 fps)
140gr yields 2900fps (+/- 100 fps)
150gr yields 2800fps (+/- 75 fps)
160gr yields 2700fps (+/- 50 fps)
My latest 270 is a Tikka T-3 Lite, it shoots 1/2 moa all day long with a 130gr Sierra 130gr SPBT @ 2940fps. Not a barn burner by any means, just a hyper reliable super accurate rifle/load combo.
I have found that the 130gr bullet is a little more vulnerble to wind deflection than other calibers I have shot.
But I will be honest, I have not tried the 150gr bullets in my 270's and think they would resolve that issue.
I believe that a well developed load in a 150gr boattail bullet at 2850 fps (or so) would work very nicely out to 600 yds. Take the time to develope your long range moa charts and you will be set for any stand hunt of your liking. Give one of the plastic tipped bullets a try.
From what I have heard (read) alot guys are using RL-22 in thier 270's. I chose H4831SC for my T3. In my M700 I use IMR4350.
Best Regards, Don
Snohomish Co. Washington
NRA Life Member