Semisane

I've gotten a lot of chuckles from this thread and have been waiting for someone to state the obvious. But no one has, so here goes.

There's a big difference between a breech plug and a vent liner. Strength and hardness are way more important in the breech plug because the threads take the full force of the pressure spike and it's possible (though unlikely) for the threads to fail allowing the plug to blow back against the breech. It's just not the same with a vent liner where the head of the liner is resting against the face of the plug. There's just no way pressure could strip the threads of a vent liner. The worst thing that could happen with even the softest vent liner is rapid erosion of the flash hole.