Fx boss shot string

does every gun very in speed a little cause I see aoa doing a review and they had a 880 average I think . Or are chronographs diffent I had it about 6 inches away from that barrel . .? Pellets were jsb 44.75 240 bar fill . 865-865-867-861-860-856-853-861-858-857-859-862-857-856-861-859-859-854-859-860-861-855-854-858-860-852-851-859-858-856-862-855-863-867-866-865-864-868. That's 40 shots with a min of 851 and max of 868. Spread of 17 stdev of 4.5 . Thanks for your input .
 
I would recommend adjusting the hammer spring tension before touching the regulator. Hammer tension screw is the bottom hole with the 5mm hex socket. The screw had to be heated quickly with a butane torch to soften the loctite. Clockwise rotation increases your tension (more velocity) and its little touchy so go at 1/2 turn increments. If your not confident in doing something like this...in my opinion...just leave it alone and have fun with the rifle! That shot string looks great and there's good possibility it will get better once you get that regulator and other parts "broke in". 

CJ