When it comes to accuracy, there seems to be no rhyme or reason with Webleys. I have a .22 Tempest which shoots really well right out to 20 yards. A 177 Mk1 I used to own was the same, but my .177 Hurricane's trigger is really heavy, even at its lowest setting, and that means it's hard to get good results with it much past 6 yards. I also have a Premier which seems to be mid way between the two extremes.
No matter which model you use, though; Webleys are very intolerant of lapses in technique. Get it even a liitle bit wrong and you'll be digging a pellet out f the shed door instead of emptying it out of the pellet catcher!