On my PSE Viper it took me many shots to finally figure out why was happening with the dial. I would have it set at 3 and after a few shots getting it dialed in it would just crash and burn. Seems the little bit of recoil from shooting was actually allowing the dial to move. [:@]I got that figured out and fixed the problem and dialed in my 3-dot scope to fine tune it.
They aren't a 50 yard bow by any means, I actually got mine sighted in at 20, 30, 35 yards. Where I hunt that is more than enough, and I would never attempt to take a deer at 40 yards or higher with it. I am patient and can wait for it to come in closer. I don't even take shots over 50 yards with my blackpowder guns even though I know I can lay the smack down on a deer well over 100 yards away like nothing.
As for my setup right now and how I got it dialed in. I can knock a acorn off the top of a squirrels head at 30 yards.

I practice often and enjoy shooting it all year long. Wouldn't mind adding another Xbow to my collection but I can't complain about the one I got. I paid $100 for it brand new still in the box and had the 3-dot scope with it also instead of just the peep and pin they are sold with.
Now I am just waiting for Oct. 6 to test it on a live target.