teamvit
Lil-Rokslider
The argument is that a crap shot with a 6.5 Creedmoor could be a killing shot with a 300 WSM. Take a quartering away shot that gets a little far back. Is the 6.5 Creedmoor going to have enough penetration to get to the lungs? Probably not. Is the 300 Win Mag going to have enough penetration to get to the lungs. Probably so. That's the difference between a wounded animal and a dead animal. Yes, shot placement is key which is an obvious statement, but to the average Joe hunter, there is no guarantee that they are always going to make a well placed shot with a 0% chance of screwing it up. In that case a bigger caliber will result in a greater chance of death. It is simple physics.
The simple physics you mention fails to bring up a very important variable, the bullet. Sectional density is a huge player when it comes to penetration. Finding the appropriate bullet for what you are pursing in whatever caliber you own is the best answer versus just buying a magnum because the internet and TV said so