The forcing cone looks like about normal ware. It, along with any top strap cutting, should get to a point and stop. Looking at yours, I think you should be about there. It's hard to tell without looking inside but hammer slop is also not unusual. It can be addressed by using a shim. Let common sense guide you. If the gun is working properly and you're not crazy anal about it, then shoot it and don't worry until it doesn't shoot. Even with that big X frame, the 500 is like a small hand grenade and it beats the snot out of the gun so loose, bent things just become a part of the game. The only way to keep the gun from wearing is to not shoot it. That kind of defeats the purpose, if you ask me.