I have one fitted to a HW77, I use Sportsmatch adjustable mounts and even with my big hands there's plenty of room to load!
To hit the targets you have to be able to range find, cheap scopes are pretty rubbish at rangefinding so you get what you pay for!
the Bushnell is very good at range finding! it's also light and you can dial it with confidence knowing it will always return to zero, unlike many cheap scopes!
£300 should get you a good used one, check the forums!