The simple answer here is to rebarrel the 7 Bee with something in the same profile but a 1:8 twist of so. You should be able to stabilize anything up to 200 gr or so (if such is made).
I would if it were a go-to rifle. I just replaced it with two 1:8" twist 6.5-300 Wbys, and I passed the 7mm Wby on to my 17-yr-old son. It shoots the 140gr and 160gr Barnes really well, which should suit him for anything for which he's going to need it for a while. Incidentally, when they started going out of production, I loaded up on some CorBon loaded 160gr TSXs. CorBon ammo, perhaps coincidentally, always shoots lights out in my Wbys, and they're usually loaded hot. Their loading launches the 160gr TSXs at 3,240 fps out of the MkV I gave my son. I wish they loaded something for my 6.5-300.
