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I’ve seen people shot with most of the common calibers, from .22 to .45 ACP, and the three magnums in handguns (.357, .41, and .44); .22, .223, and .308 in rifles; and 20 and 12 gauge in shotguns…including 2 patients that were shotgunned at contact distance. With the exception of the 2 contact shotgun wounds, and the guy who took a .308 to the head, the other entrance wounds all appeared to not be any larger than the caliber that made them.

1. A 20 gauge contact wound to the leg immediately above the ankle, nearly (but not quite) severing the foot.
2. A 12 Gauge contact wound to the base of the neck, the entrance hole being approximately an inch in diameter with deep burning and stippling around the edges.
3. A .308 to the head with pieces of the skull missing and a large amount of brain matter missing. He lived, incidentally, curled up in the fetal position in a vegetative state for 2 more years before finally exiting this dimension.

In the case of the two shotgun wounds, the entrance holes were larger than caliber because of the destructiveness of the muzzle blast. In the case of the .308 wound, enough skin, bone, and brain tissue was missing to make it hard to tell where the bullet entered and exited.

Otherwise, entrance wounds, even from pretty powerful cartridges, are fairly unremarkable in size.