Are you looking for brit spec headspace gauges?

[bonnie]

I'm a LE shooter. How are they useless. bear in mind am not savvy on this.

What I found out was after buying the Forster Field gauge in British .303 that it is set to measure .070 as the maximum allowed headspace for an Enfield Rifle. Which is wrong.
The maximum allowed headspace is .074.

I cut a shim from a .004 feeler gauge and held it in place with a smear of oil onto the .070 headspace gauge to give the correct reading of .074 when I checked my Enfields.