RE: caliber or bullet weight
I vote "Bullet Type". I think a smaller caliber premium bullet out of a 7mm Rem Mag is going to perform better than a regular soft point bullet coming out of a .30-06.
I think a .270 shooting a premium bullet might even be better than a .30-06 shooting a soft point.
You constantly see discussion over caliber and bullet weight but rarely see much discussion of bullet construction and type.