Bullet fragmentation in a 7mm?? If I understand right you are saying a 7mm bullet will come apart more than a .30 cal one? This is nonsense. If you compare for example the 175 Nosler partition in 7mm to the 180 gr .30 cal I think you would find that the 7mm penetrated deeper due to its superior SD. Not saying that is especially the best bullet in a 7mm, I'm just using it as an example. Bullets coming apart are the result of bullet construction and excessive velocity. Some bullets are designed for standard velocities and when pushed through magnum cases are pushed beyond thier intended uses. That is when you get bullet problems. Use a proper bullet for whatever round you pick and you will be fine. Wether you choose a 7mm or .300 mag they both require premium bullets especially for shots under 200 yds.