That is not even in dispute, nor is the answer of a guide required. People who can't shoot are a much bigger problem that people who are undergunned.
However, if you can shoot, the "bigger" gun has the potential to perform better. Though you really have to go beyond 270 to 338 Mag on elk debates before the bigger gun's potential really starts to make a difference......like say a 270's ability to stop a cape buffalo or a 30-06's ability to stop an elephant vs that of a 416 or 458.
