I was a bit low on ammo, so I actually used the repeater on 'em. Basically, the key to what I did was charge against them and sidestep when they start to swing; you can usually dodge the blow and give yourself a second or two to line up some shots. By using rapid fire and moving enough, they aren't too bad.
A related strategy is to set up frag mines to cripple their legs and kite them.
Silly post frequency limit...
I just shotgun them. Run up, shotgun, backpedal to dodge, repeat. I have to keep moving around though, as I'll quickly back against a wall when doing this. I usually only get hit 1 out of 5 swings when I do this.