The 270 Win is not a problem for LR for any thing from deer sized animals on down. There have also been plenty of elk sized animals taken with the proper hit at some really long distances.
A great powder choice is RL-22.
Use non-magnum primers i.e., CCI-200s
Start in the low 50s area w/the powder and work up. I stopped at 58.5 and 3200 as that's fast enough for the winny.
Good bullet choices are:
Hornady SPBT 140s
Sierra Game Kings 130 Boat Tail.
Berger 140s and 150s
Max velocities with max loads and 130/135/140 class bullets will be real close to or exceed 3200 fps.
Milk jugs were DRT @ 650 yds which is where I stopped as I transferred ownership of the rifle to my son. Now its a safe queen.