If the rifle shoots that bullet well, and your daughter is comfortable with the setup, go for it! I have zero hesitation using a 140 gr TSX or TTSX out of a 7 mag. I have two 7 Rem Mags that I feed with Barnes bullets. I have taken bulls with both the 140 gr TSX and 150 gr TTSX. I'm not wed to just using Barnes, they are just very accurate bullets in those particular rifles. Tried 160 gr TSX bullets at the range but accuracy wasn't as good.
