For you Enfield collectors and shooters.
Its not the headspace that gets you, its actually the "HEAD CLEARANCE" or the air space between the bolt face and the rear of the case that causes your cases to stretch. This applies to any type case, rimmed, rimless, belted etc.
Many people blame the Enfield rifle for short case life, the real problem is American commercial factory cases are not made to British military specifications. If any cartridge case is properly fire formed with the base of the case against the bolt face it will last much longer.