In my experience the 7 Rem mag kills as well as a 300 win mag on big gameand on deer it is even more effective. I once shot a 6 point cull deer on the property in Alabama and hit him a little farther back with a 7 WSM , I think I had some brush deflection because I had a small hole to shoot thru to kill him, might be that the bullet keyholed. Bullet hit him ..not in the guts but just ahead of the diaphragm. Using a 150 grain powerpoint that sucker ran 200 yards. The autopsy confirmed that the lungs were jelly .Prior to that any hit with any 7mm mag and the deer went zero yards DRT. I think there was a poor trailing job on the deer mentioned above.. If one bullet never mind 2 were placed thru the lungs with that round it is dead within a very small distance.