260 pushing factory 140 SGKs seemed to work okay. The more I shoot it, the more I leave the 300 WM in the safe. Just got the wife a compact for Christmas, and with the limited shooting I've done with it, it seems to look promising.
Note the 2nd cow was after we helped a guy track and gut a cow that he had shot about 10 times with a 270 shooting the never-fail Remington Core-Loks.