chronograph results tell me the good ,bad, ugly

was down flat on my back from falling on the ice for two days, drove to a friends, and borrowed his,Caldwell - I need to buy one,

took me most of the morning to get it hooked into my ph and note8

got 8 shots before my LED light pucks stuck up on the plastic canopy's batteries died in my basement, then all i got was error,mesages,

HW97K T brand new, scope'd with a bug buster until i get a big boys scope for it crony was about 1 foot in front of barrel end





Using Exact Jumbo Diablo 14.35 pellets

FPS------ foot pounds using pyramid air calculator 

648 13.38

650 13.47

625 12.45

671 14.35

670 14.31

653 13.59

649 13.42

633 12.77



this is around the 30 or 40 pellets ive put through it, as i just bought it im crappy with math, (brain-Damage) but it looks like around 13 foot pound average

will this when its broken in show a consistent "number" result with a given weight pellet?



thanks

John