I have always struggled to get my old Airsporter S 177 to be accurate. I tested the barrel when it was in pieces by rodding a pellet down it. It seemed to barely touch the sides all the way down! Despite that, a change of spring to a Titan no.5 (the one for the meteor) resulted in a change of preferred pellet to FAP and excellent accuracy if I do my bit. Also I have been shooting paper targets with one of my Diana 34s over the last couple of days as I couldn't get it to group. The gun has shot very well in the past with FTT, but seems to hate everything else! I have been trying every pellet in my collection which is all the decent round heads in all head sizes but to no avail, I even swapped scopes but still no joy. Last resort I cleaned the barrel which is not often done on springers by me but it seems to of worked! FTT are grouping nicely at 35 yards now, could of saved myself about 500 pellets if I'd done it sooner!