ok, I have been getting a ton of calls and quite a few bows sent to me by customers who are unhappy with their gt500's needing to be set up way left to tear a bullet on paper.
The fix is quite simple.
The issue that I have found in 90% of these bows is the spacers. If you have a quality caliper you will find that most stock gt500's come with a .070 spacer on the string side of the cam and a .055 on the cable side.
I find that if I stack two .045's on the string side to give me .09 and use a single .035 on the cable side of the cam the rest will paper tune much closer to the center of the shelf, around 3/4" to 7/8" typically as opposed to many which are over an inch.
These plastic spacers are available from elite. The .045's will be in a bag marked .5 and the .035's will be in a bag marked .40. My caliper measures different than theirs ;> Also, some are black plastic, some are brown plastic, doesn't matter, they are the same. Just make sure to measure them with a caliper before putting em in. Also remember thicker on the string side of the cam to move center shot closer to the riser.
They are dirt cheap and makes the center shot a lot more palatable, at least imo...
I'll be leaving for a western Ohio bowhunt late tonight and wont be back till next Sunday. If anyone has questions please use my regular email that goes to my blackberry and I'll try an get back to you.