In reply to danieleaston:
Range West is open for all of the month of August, but otherwise it is only open at weekends and on days and evenings when there is no firing.
The road to access it is the road to Stack Rocks, so if that is shown as closed 7.30 am to 4.45 pm you should be able to climb in Range West after 4.45. On Friday 11th June the road is shown as open all day - that probably means that you could climb there all day, though it would be best to phone the guard house to check.