A 3-9x56 isn't the best scope. Its just a range of mag and the size of the objective lens. Build quality varies massively! Buy the best scope you can afford and sportsmatch mounts. And don't expect to hit 50p coins at 100 yards it's a hw90 you have again isn't it?, if I remember you rightly. Save your pennies, buy a better scope and lower your expecations of 100 yard 50p shots ffs.