I bet a 156 Norma or 120 Barnes would sail thru one fine from a 6.5BR, having seen what a 175 does to a tree from a 7BR.
I'd want a 338/06, 9.3, or 350 RM myself. 338 WM is fine as the 375 or 416, assuming one can shoot them....the last few - some may not.
FWIW Jwall - a 200 Noz from a Springfield will about match a 338/06 210 PT according to Aaggard's test results - in penetration. I would not feel woefully underpowdered if quality 180-220s used.
