Lately I've taken to just always dropping into the most populated and dangerous place I can to try and get combat practice, as I feel my looting n' running game isn't too bad, and I haven't had quite as much time to play in the evenings... Also quite often joining squad games as a solo player; at first I assumed it would be impossible but it seems to be good practice and you almost have a bit of an advantage - people in squads often don't play so carefully and you've more chance of spotting them, plus you can have fun exploiting their will to save their squadmates if you happen to knock one of them down