Has anyone flirted with the idea of a Cammed hinge pin ?
A Head on one side, and drilled / tapped on the other, Cammed like .005 ? so you Loosen the pin, turn till tight / pre determined torque... whatever works.. Re tighten and it's "Fitted"
Of course the Latch would still need checked, but a single reciever could handle most any barrel, and it would take up any wear / stretch that happens with the heavy hitters.