Well, my question would be how far are your shots probably going to be? I would definitely not go below 7mm-08 just because of the frontal area of the bullet, the larger the better. Unfortunately your wife is going to have to shoot something in the slightly mild range, but remember range shooting for zero is way more painful than shooting at something with your adrenaline pumping and is usually just one bullet and not 20-30. I'm assuming that you mean black bear and if your shot distances are somewhat streched out that she could use a 270 or she might try a 270 WSM which in my mind the best short magnum out right now because of its versatility. It will kick more than a 270, but your ballistics are fantastic. I would go with the heaviest bullet just for the ballistical advantage ( more surface, longer bullet). Black Bears are not really that tough, they just have fairly thick hides. In the 7mm-08 range the 140 grain or larger, providing you can find heavier factory loadings. The 270, 150 grainers are a nice choice. The 270 (.277) versus 7mm(.284), not a whole heck of alot of size difference, but I do feel that the 7mm-08 will kick the least for what is suitable for bear. Don't forget the .308, 30 caliber bullets are great for this kind of hunting. Hopefully I helped a little. Happy Hunting, Joel