Before you think about attempting a shot at 500+ yards, have you practiced enough at those distances to put the bullet in the vitals every time? If not then I would advise against it. I havn' t shot near enough at those distances to let the thought even cross my mind.

After saying all that, If you do not feel comfortable in your rifles and your abilites then don' t use it. You need to have confidence in your equipment. If you do decide to trade for a new gun then you will need to practice with that one also.

One thing you should do is inform your guide your maximum range, what ever it is, and that you will not shoot over that distance and make him earn his money. If he is a good guide then he will get you on the elk. That' s what you are paying him for. You should be able to get within 300 yards or less of about 95% or more of the elk out there.