I would say bullet construction is the difference. The tougher 7mm bullet retained its energy better. As an example for years I hunted with 338 win mag and 200 grain bt's nothing made it past 30 yards most were bang flops (deer). One year I get an elk tag and switch over to 225 partitions. Before the elk season I shoot a deer at 30 yards through the lungs and the thing runs the better part of 300 yards. The bullet punched through and hardly noticed that it hit something.
The BT being "softer" expands more and in deer size game produces lager wounds. The transfer of energy did play a role in killing stuff faster but only to the point where the transfer of energy deformed and fragmented the bullet, and that process causes holes which cause a fatal loss of blood.
|