After some help from those more ballistically informed than me!! I have just purchased a (new) heavy barreled RWS Ttitan in .22 -250. I have tried to zero but with little success. Admittedly I have only tried Federal ammunition so far, but I would have expected at least some sort of group unless this rifle really dislikes this ammo? I have tried two scopes as check and adjusted the trigger pull down to match my other rifles. I have put on the T8 mod off my 30-06( minus bush) until I get a dedicated mod for this rifle, could this be the problem? Not tried shooting it without a mod, but seems to spraying shots around like a garden hose at both 50 and 100yds.