The strongest breech would be unworkable as the heart of a usable rifle. It would comprise (a) a long, large nut* that the barrel would thread into from the front, (b) a threaded "bolt" that would lock the cartridge in the chamber (c) with the circumference of the case head totally supported by steel. The "bolt" would of course have to contain the means of firing the primer, but no extractor or ejector. The "receiver" nut would have to be too short for any loading-ejection port, and the chamber would have to have a sharp edge (no feed ramp) right smack-up against the face of the "bolt." Such an action would be easy to make on a small to medium lathe -- but sheer misery to load, shoot, empty, reload, etc.
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<br>*or a cup thick and solid across the rear, threaded to receive the barrel in the front
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<br>Sheer mass isn't the answer, nor is any of the other known metal alloys better than the best steels. Somewhere, I read how the burst strength fails to increase significantly past a certain thickness of steel surrounding the chamber.
