In reply to Flinticus:
It took me a while (about 6.5 hours, I think) but I'm not very fit just now, and the snow was a bit difficult higher up - crusty on top, soft underneath, and I was falling through it most of the time! It's mostly only a few inches deep, though.
My map's quite old, and doesn't show the forestry tracks correctly. I cut down through the clear-felled area on the North side of Beinn Bhalgairean, hit the wrong track, and ended up well West of where I meant to be, with some wood and bog-bashing to get back. The track shown on the link below is much more detailed, and might even be mostly correct!
It's probably easiest to walk up the track to here
http://www.gaelicplacenames.org/maps/map.html?g=NN220245
then nip up each hill from there, return there, and head back the same way, rather than to try to make a circuit.
The East flank of Beinn Bhalgairean has been partially clear-felled, and it's easy to get up through that at the North end, near the circle on the link above - see here:
http://ootnaboot.scot/winter2015-6/20160225Beinn_Bhalgairean_from_Meall_nan...
Have fun!