There is clearly excessive space between the frame and the cylinder rear face. How wide is the barrel to cylinder gap on your revolver?
It could well be that the barrel set back in the frame is inadequate, leaving too much space for the cylinder to fill between the rear of the barrel and the frame's cylinder face at the rear of the cylinder.
In the firing cycle, the high pressure generated by the powder will seal the case against the cylinder wall, holding it in place as the high pressure gas pushes the bullet out of the case mouth, into the cylinder gap and then into the leades of the barrel's rifling. During this high pressure pulse, the primers are being pushed back against the rear face of the frame. There is too much space allowing the position of the rim to be anywhere between the back of the cylinder and the frame face. When the cartridge is ignited while the rim is against the cylinder rear face, the primer can be pushed out into that space, stopping against the frame. The gap is too large.
Get back in touch with S&W CS and ask them to re-evaluate your revolver.
Marc:
First thing I'd do is make sure the bores are clean and free from any carbon buildup that will impede case movement.. If that don't alleviate the issue then the frame to cylinder space needs to be set back a couple thousands. I'm wondering if the OP banging the extractor rod on a table to extract stuck cases aggravated the face to cylinder clearance? Not having the pistol in hand, it's only conjecture on my part.
Me, I'd start with the easy part first (making sure the bores are clean and carbon free. If it was a face to cylinder issue, ALL the cases should have popped primers, not just a few. IMO, the pocket retention is loose in the case and the dragging case in the bore is magnifying the condition.
I've never cared for calibers that allow multiple loadings to be fired, especially loadings with shorter cases because that makes it easy to develop a carbon buildup at the end of the bore where a longer case will go... Sometimes, cheaper alternative (lesser cartridge, especially shorter case length) can cause issues. Why I asked if the OP had shot a diminutive load prior to the 460 / 452 bullets.
My 460 never sees anything but 460 cases. I see no reason to shoot anything else. The recoil isn't that bad, in fact, it's less than my 44RM in both lateral and vertical (muzzle climb planes).