I don't think anyone has the .460 yet. If they do I'm going to fire two gun dealers. As far as the 500 is concerned, I've got the three major sizes. 4,8, and 10. I usually leave out the fractions. I shoot the 8" exclusively. I have shot a couple hundred factory round out of it and I notice no adverse effects. Nothing has loosened up or broken. Shoots just great. I have had the issues of double fireing once and cylinder skipping tree times. In my best estimation, it was caused by improper trigger control. These monsters carry a lot of recoil. My nephew one handed the 4" and got the double fire. Scared him to the point he doesn't want to shoot it anymore. He He! Any revolver will unlock with slight pressure on the trigger, thus allowing the cylinder to rotate. After I became aware of this, it hasn't happened again. Most of the rnds have been pretty stoust. 385 gr or better. As far as lighter loads, I would recommend the 235 gr Hornady or the 225 Ultramax. These are very mild, as .500's go. I shoot them 1 handed easily. I'm not a gorilla. I keep the other 2 in the safe for my grandkids. The 8", I bought used, so It been shot plenty. Get the .500 of your choice, I think they're great guns. Incidently, my major shooter is a Super BlackHawk.
good shootin
kid