The 76 actions I think are made in the same way but have some very large calibers such as 45/60. What is so different about this action than its earlier versions?
For one thing, they are about a 1/3 again bigger action then an 1873.
But even then, they were down-rated to handle a
maximum of 20,000 PSI.
The 1873 was rated at 22,000 PSI
For another, all of them were only loaded with black powder at the time.
And actual black powder pressure was probably way less then either 20,000 or 22,000 PSI.
Italy proof-tests their modern reproductions with a Proof Test pressure 30% stronger than the maximum pressure of a commercial cartridge.
Proof Testing only insures the gun will not blow up with a 30% over-load. It does not insure the action won't stretch or wear out much sooner.
They Proof Test .45 Colt at 15,945.
SAAMI max pressure for .45 Colt is 14,000.
And I agree with SASS #23149.
I have seen no evidence the modern replaca guns from Italy are as precisely fitted, or as well heat treated as the old Winchester & Colt orginials.
rc