Method How to commit suicide by shotgun Best without simply having a large chunk of your brain hanging off of you

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Hello, I am currently planning on buying a shotgun through a private sale due to the fact I likely cannot buy one due to the fact I was involuntarily commited. So far, a Mossberg 500a and a maverick 88 seem to be the best candidates to commit the deed. However, where would I shoot if I desired death between only a few seconds to a few milliseconds? How can I absolutely guarantee the brainstem be obliterated? I plan on using 000 buckshot in my attempt.