The headspace + the bolt stretch during firing of an Enfield are typically many times worse than what we would call unsafe in other rifles.
My attitude is Silver Solder a shim to the bolt face and make wimpy loads with slow powder to keep the 303 Brit brass going.
You can't hurt a 303 primer pocket.
The 308 brass failure modes are more often loose primer pockets or split necks. Sure, they can stretch if someone adjusts the sizer die to touch the shell holder.
The 308 necks will live a long time without annealing if the neck is sized with a .330" neck die or bushing. Or if the chamber was reamed with a custom reamer with a .334" neck for no turn with Win brass.
The 308 primer pockets will last a long time at 55 kpsi, or at 80kpsi if Lapua small primer pocket 308 brass is used.