Slow and heavy has worked for me best...6.5x55 & NAB's or C&C 140's, but amazingly clean entry/exits with reliable DRT's from 9.3x62 & Speer 270's has been the best.
My 270's regardless of bullet used, it takes careful bullet placement, along with the usual suspects like my 300WSM/300WMg thru even fragile 243's in years past.
Ron