Parked at start of drive to Glen House at NT305336. Solo. Followed Cross Borders Drove Road to start with. Deviated to include Little Craigie Side. Back to CBDR and up track marked on OS 1:25,000 near a line of grouse butts. Used a path that is a continuation of this to go over Birks Hill to Birkscairn Hill. Noted that OS have 661m spot height on NE side of fence and not at cairn. Continued to Dun Rig. Beautiful sunny day feeling cold in the wind.