Help Gun placement

[needtogo]

I'm planning on CTB hopefully within a month by Shotgun to the head. I've been debating going through the mouth or going from temple, but I'm just somewhat concerned because I have a big head and a hard one at that. How should I go about this? Should I not be worried given the power of a shotgun? I'm going 12 gauge 00 buckshot. Will it matter that much?

 

[Throwmyselfaway]

I would check the resource guide but do not go through the temple. Mouth at like a slight angle