Removing the barrel and headspace check

[Robinhood]

Always. Every time you screw a barrel into an action, always check head space.

This every time. If the barrel ever turns in the action even the slightest amount. Check and double check with no-go. If you change the bolt head the same thing applies. Check headspace.

You can use both gauges and sized cases. Always use a shim on the go if I don't have a no go.

Close the bolt on the action, screw the barrel down until it bumps the bolt head. Back off a quarter turn, install gauge and close bolt, adjust to contact with shoulder and back off a small degree of rotation. Tighten nut and check with gauges.