I HAD a 342 Ti once. I shot several hundred rounds of plinking ammo through it with no problems. The first time I put some of my self-defense loads through it, it backed the bullets out of the shells just enough to block the cylinder from rotating to the second round in the cylinder.

If you are thinking of running +P through your J Frame, especially if it is one of the air-lite models like mine, be sure you have PLENTY of crimp on the bullets and have shot over a hundred rounds through it without incident. It would be a bitch to have it impinge on the second round.