now what would a case sitting in a stripped die tell me about how a case would fit in a chamber? I have to lube a die and apply a great deal of force to a case to get it into a die. The case will fall in and out into my chamber until I fire it and the brass expands.
Like wise the head of a case forced into a bolt with no support for the body of the case from the cahmber walls shows nothing as far as how that case sits in a closed chamber. This is just nonsensical noise in my opinion.
maybe this would help you understand a bit better
Understanding Headspace (Gunsmithing Student Handbook Series)
it's only fifteen bucks