Sunray, you got to stop it with the Enfield and headspace thing.
Of all of the 50+ Enfields that passed through my hands the few that did have slightly lax headspace all passed no go guages. Those that were a tad loose can have any "issues"resolved not with an expensive bolt head, but a 10 cent o ring or proper prvi ammo.
The fact that we don't see any Enfield blowing up failure threads here is evidence it is a non issue.