You will probably hear it both ways. For me, when I headspace I push the headspace gauge into the chamber delicately close the bolt. screw the barrel or action in until it stops. Snug the barrel nut with my fingers. Open the bolt. If it ejects, I am of the opinion that the bolt face has been in contact with the gauge. Reinsert the gauge and double check.. I then mark my barrel ad action. Open the bolt, tighten the nut, recheck with both go and no go. If the lines still line up and the gauges work I'm good. Most of the time I use a sized piece of brass to verify the headspace to my die setup. That way all my brass will fit at its current size.
So to answer your question, for some you don't need to disassemble anything.
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