I have a Barnett Predator and it's an AWESOME weapon. 175 pounds of pure accurate power. 60 yard shot dead center is a breeze. Do yourself a favor, once you get your scope sighted in print out a label on your computer with the 20, 30, 40, 50, 60 yard scope positions and stick it on the gun. On mine the first cross hair is 20 yards, 2nd is 40 yards, dead between them is 30 yards. Same holds true for the longer distances. Also, after you choose your bolts be sure that the pressure bar is putting on the bolt to insure accuracy shot after shot.
You can pick up a predator for about 550 bucks. If you're new to the sport remember to buy some rail lube and keep the rail slick......lot's of pressure on these bows.