We ascended Slieve Bearnagh at the beginning of August. The night before, we camped at the foot of the Mournes, in the Mweelmore Lodge site ( http://www.meelmorelodge.co.uk/ ). On a beautiful Sunday morning, we started the ascent using the usual Trassey Track route (car park at start = J 311 314 A). We tracked up to the Hares Gap (J 323 287 B), where we crossed the Mourne Wall. We then headed steeply up to the fantastic rock formations on top of the North Tor (J 316 283 C) (which picture, taken from the peak, illustrates). Finally, it was up to the peak (J 313 281 D), where we lunched. We descended steeply down by the Mourne Wall on the other side, and then back to the track up from the car park. A wonderful hike - beautiful scenery, and great rock formations. Thoroughly recommended.
I've put a Google Earth track of our trek on the web at: http://www.hy-brasil.com/googleEarth .
We used the 1:25000 OS Northern Ireland map of the Mournes ( http://www.osni.gov.uk/paper/activity_maps.html#am1 ) . The following evening, we moved to a different camp site, closer to Newcastle - Tollymore Forest Park ( http://www.forestserviceni.gov.uk/our_forests/tollymore/tollymore.htm ), run by the Northern Ireland Forest Service. Linkback: https://mountainviews.ie/summit/83/comment/2029/