"...Is Headspace ALWAYS set with changing the barrel/chamber?..." Yes. However, it's a fitting thing.
The bolt should close completely on a Go. Not close completely on the No-Go. The only time you use the Field is if the bolt closes completely on the No-Go.
"...the effect each one would have on the length..." No bolt has any effect on any chamber. The headspace is either good or it isn't. Since you have 35 Springfield bolts you have the same luxury the weapons techs had. You can try 'em until you find one that works.
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