Bolt should be closed in the fire position. If new to head spacing a barrel do a youtube search. later
Don , if it's a new to you cartridge, I would set using the go gauge , based on what your dies are telling you . Resize a case and make sure it'll push the shoulder back as far as you need , and use that as determining where to set headspace . I agree with what Dusty said , no go means it will not even get to the vertical cuts in the receiver /bolt , it may start on the ramps but not any further.When installing a pre fit barrel at what position do you like the bolthandle to stop
at when checking with the no-go gauge? This is a right hand action. I have both gauges.
Thanks
Don Dunlap