Hi all my 1st time posting

I recently got a new sub12 fx impact m3 .177 im looking for some tuning advice

i've put a good 1000 pellets thought it now it seems to be good at around 60 yds but past that its all over the place im not thinking that it should be pellet on pellet at that distance by no means but I would like to knock a target down every now and then !!