I have an FX Wildcat mkl in .25, it sends 25.39 job's on average 850 fps but when I shoot the 33.95's it drops to 650 fps. Is this normal? I understand its a heavier pellet but didn't expect this big of a drop. I have it zeroed at 50 yds for the 25.39 and the 34's are 6" low. Can I tune it to shoot the 34's at about 850? Thanks Jamie