I have always shot strictly 150g bullets in my 7mm Mag...for both Elk and Deer until recently. I am now loading 160g Nosler Accubonds. I prefer a bonded bullet in the high velocity magnums I own...like the Interbond or Accubond, currently I am loading 160g Nosler (unfortunately Nosler doesn't make a 150g Accubond yet). That being said, I don't hunt mush with my 7 anymore...have others I prefer.

More importantly than weight is finding a bullet your rifle likes. There is also no reason you can't use the same bullet for both deer and elk...150g or larger in my opinion. Pick up a couple boxes of different brands and head to the range and find the one your rifle shoots best (sometimes its the cheep stuff, sometimes it's not), then stick with it.

Also consider that different bullets perform differently at different velocities...and the 7mm shots at 3000 fps or faster in general (some will say unbonded bullets will not perform at their best over 3000 fps...I dunno...I shot 150g Nosler Ballistic Tips out if it for years and never had a problem.)

I prefer to use a premium bullet, especially in my magnums, as opposed to cheap ammo like Rem Core'Loks...had a bad experience with them in a 30-06 and 300 WIN Mag both before...but others swear by them. As I said, find what your rifle shoots best, as accuracy is more important than bullet brand.

Happy hunting!