I have been hunting with a 7mm Rem Mag since the early 80's, I have tried multiple factory brands and bullet weights over the yrs. Then go into reloading in the early 90's, with all my experimenting I believe the 154 gr Nosler ballistic tip to be the best performer on whitetail deer. Unfortunately, Nosler discontinued that bullet a few yrs ago. So, you either have the choice of 150 or 160 grain. I have not yet tried the 160gr. to compare it to the 154gr. as I still have several boxes of the 154's to use up.
I used Remington Core loks in 175gr for yrs. (recommended by fellow hunters), I was not happy with the results of the bullet. It killed deer, but always punched a very small hole straight through, very little expansion. The only time I can actually say I have great expansion from that bullet was on a deer I shot standing head on facing me, I hit him at the base of the neck and retrieved the bullet just inside one of the rear hind quarters, it was a perfect mushroom but took traveling the entire length of the animal to do so. AND...............I always had to track them 50-75 yds after the shot.
I switched to the Nosler ballistic tips and it has been bang/thud. NO Tracking. I did have a big bruiser drop in his tracks, jump up and take about 10 steps before nose diving into the dirt.
FDXX75