Originally Posted by RobF
I could illustrate the point further, but there may be one close by reading...
i didnt realised you had got a styer, if it newish ( less than 3000 shots ) then they are a f****ng nightmare), the barrel, as you are already doing will need cleaninig/scrubbing religiously until the internal plating smooths out ( usually after the 3000 ) before the barrel resettles.
mine and several others had the same problems, mine now shoots spot on, but if you dont need the hassle, ditch the barrel for a bsa barrel but be warned they can be very pellet fussy.
for everyone else who read this, these are my own findings, yours may be different, but it doesnt make either right or wrong, just different circumstances/barrels and setups.