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I found a Stevens break action .410 at a gunshow for $50 and recognized it as being designed much the same as my Handi Rifle 45/70 that I did a stress analysis on, and tested to verify that it is much stronger than the brass.
So I bought the gun for some fun tests.
1) I cut a 7.62x54 case down in diameter on the lathe and shot a .452" FMJ 230 gr Montana Gold bullet in a 2.110" case, CCI200 primer, 45.5 gr H110, 2.900" OAL.
Recoil was horrendous. The primer slightly cratered. The case was not
sticky. The .385" choke spit the muzzle back .25" to the front sight hole and the barrel now slugs to .395".
2) 405 gr 2.1", 40 gr H110, CCI200 large rifle primer, Win45Colt brass, compressed, top hat and catered primer, .004~.005" case head expansion, case head to body cracking.
This is a double charge of the 454 Casull max load, and a little longer in OAL.
I shot lots of other loads too, leading up to those.
Before I reached the above loads, I realized I could not take the recoil. The super loads were with my left palm on the butt and absorbing the recoil over several feet, not an inch, like my shoulder would.
I also drilled and tapped the shotgun, and put a Weaver rail on it [I made from a Tapco AR15 riser], but I have not scoped it yet.