I no longer use a 7mm mag and haven't for years. When I was tho, I tried about eery bullet I could find. Finally I setelled on the 160gr Speer bullet. It was plenty tuff enough and kept it's weight well. In hind sight, I think the 175gr bullet would have served as well. I wouldn't concider anything smaller than the 160gr for fear of bullet failure at 7mm mag velocities. That is on heavier game. The deer I shot with the 140 class bullet's got tore up pretty bad. One bear I shot with a 140gr Sierra I had to shoot again because the bullet didn't make the trip, it blew up just under the skin in the chest.
I'm not sure you really need even 160 and 175gr bullets other than to be sure the bullet's don't come apart up close. I've had the 160gr bullet completely penetrate several elk.
Everyone has different ideas about trophy pictures. Looks around and you will see "long armers," "set behinders," "big cheesers," and "blood covered brutes." I have a few tips to keep your trophy pictures from being laughers or worse yet just plain gross.
#1 Clean it up. Try to avoid bullet holes, gut pile, mass amounts of blood, and the tongue sticking out. You don't want your big buck to look like a angry 1st grader with his tongue out or a MMA fighter during the 3 round.
#2 Long arming...