Hornady 'Superformance' 130 gr. Been using it for years in my Sako L61 with no problems, more accurate than best factory lead loads and nothing but clean kills. Just don't believe the advertising hype that says "no more felt recoil", you can feel the difference but not a problem if you are used to 270.
I have generally found that 'faster is better' in terms of both knock down and accuracy with copper bullets.