Sounds kind of interesting.. I was looking up case pressures for the 500 here is the link
SW 500 Data450px-500SWMag005.png
The .500 S&W Magnum has a maximum working pressure of 60,000 psi (4,100 bar). However, most factory ammunition is limited to 50,000 psi (3,400 bar) to help ease extraction of fired cases. The cylinders of the S&W Model 500 revolver are engineered to be capable of withstanding 50% over pressure. Regular proof-load testing is performed at 20% over pressure.[6]
Cylinder bore ∅ is given as .500 in (12.7 mm). SAAMI recommends a 6 groove barrel with each groove being .130 in (3.3 mm) wide. A barrel with a bore ∅ of .4880 in (12.40 mm) and a groove ∅ of .4983 in (12.66 mm) is also recommended. The recommended twist rate is 1 in 18.75 in (476 mm). While the bore diameter of .4880 in (12.40 mm) is consistent with other firearms which fire a .500 in (12.7 mm) diameter bullet, the groove diameter of .4983 in (12.66 mm) is an oddity as most firearms which fire a .500 in (12.7 mm) will have a groove diameter of equal to the diameter of the bullet.[8] For this reason regular cast lead bullets should not be fired in the revolver as excessive leading of the forcing cone and barrel will occur, leading to excessive pressures or the deposited lead acting as an obstruction in the barrel or forcing cone.
While the overall length is given as 2.300 inches (58.4 mm) by many sources, some revolvers will not be able to accept cartridges with bullets seated to this overall length. This is because the cylinders of the revolvers are too short to accommodate such cartridges. The now-discontinued Taurus Raging Bull 500 is an example of one such revolver. It has a cylinder which is about .200 inches (5.1 mm) shorter than that of the S&W Model 500
7.62×54mmR maximum C.I.P. cartridge dimensions. All sizes in millimeters (mm).
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Americans would define the shoulder angle at alpha/2 ≈ 18.5 degrees. The common rifling twist rate for this cartridge is 240 mm (1 in 9.45 in), 4 grooves, Ø lands = 7.62 mm (0.300 in), Ø grooves = 7.92 mm (0.312 in), land width = 3.81 mm and the primer type is Berdan or very rarely Boxer (in large rifle size).
According to the official C.I.P. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) guidelines the 7.62×54mmR case can handle up to 390 MPa (56,564 psi) piezo pressure. In C.I.P. regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C.I.P. pressure to certify for sale to consumers.
If you went to 60,000 psi I think the lugs should be able to handle the difference in pressure.
Seeya
Mark
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