If she does feel comfortable going bigger then a 270, get her a 270. Put a good recoil pad on it.
Like I mentioned earlier for bison we have to use a 175 gr bullet or heavier although Woodleigh does make a 180 gr 277 bullet..........
Ok, I see your delima, it's a legal thing.
If you are a rifle looney I'd suggest a 280AI for your beautiful bride. It's similar to the .270 she's comfortable with, has good factory 175gr bullets available (like the 175gr partition for Bison), and is not hampered by anemic load data. Your choice of a good 140-150gr bullet would make a nice reasonable recoil general purpose load for her to pair with the 175gr load.
Of course, the simplest solution would be 30.06.
