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Thats why "headspace" is in quotations. The forcing cone needs to be set at a certain depth depending on the angle used. There are special gauges, much like headspace gauges that check the forcing cone depth.
The gap is always contentious. Target shooters like them tight because you lose less velocity from escaping gases with a tighter gap. However, if the gap is too tight, your gun can jam up. I believe the standard from Khunhausen is to set the gap between .003" and .005".
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