I'm not sure how much different the Predator is to my Barnett Jackall (150lb - 315fps), but I shoot 125grn Rage broadheads using the 3 dot sight that came with it. I sighted in top dot at 20 yds. At 30 yds, it's 2" low using top dot, 40 yds is right in middle / between 1st and 2nd dot, and 2nd dot is dead on at 50 yds. This is only at targets. Although I'm confident of my abilities to hit what I'm aiming at, I did experience my first x-bow deer jump the string at 42 yds ending in a bad shot, so I cap my kill range at 35 yards, and just aim my 1st dot a couple of inches high at those distances. In my estimation, that's pretty flat shooting, and with a 125 grn broadhead you get the extra punch at contact for deep penetration. Most of my kills have been complete pass through even at 30-35 yards. Hope this helps.