ORIGINAL: BrutalAttack
Any hunter will tell you that dead is dead. It's simple physics. You have a projectile of a knownmass traveling at a known velocity that generates X energy.

Modern big game bullets all perform well enough to take any north american game regardless of diameter. Expansionand performance isn't dependent on bullet diameter. If anything, 7mm bullets are more efficient which translates into more retained energy hence the higher ballistic coefficient of most 7mm bullets.

If you feel that a .308 bullet will "kill better" than a 7mm bullet than post something to that effect.

Opinions are basically worthless without some kind of fact backing them up.