copied this from the NW airgun forum:
From the south, exit M60 Junction 13 to the roundabout, turn right (3rd exit) underneath motorway to a roundabout.
Go straight on (2nd exit) onto Barton road (B5211) carry straight on for about half a mile and there is a sign on your left that tells you your speed, take your next right into Grange Road
(shop on the corner).
At the end of the road keep left and follow road over the top of the motorway, past the farm on your left, carry onto to T junction and turn right
, carry on past cottage on your right (beware of speed bumps here) approx 300 metres on left is oldham airgun club.
Google map - this link should take you all the way to the club ground from essex:
Also for SATNAV : Postcode M30 8JW - Will put you in Grange Road.
When you get to the end of grange road it seems like a dead end but keep left and follow the lane off to the left and over the motorway bridge.
Go Past the farm immediately after the bridge then carry on up the lane to a t junction.
Turn right and keep going for about a half mile past a bungalow/cottage on the right.
Another couple of hundred yards and you are there.