i'm currently in a winny/anavar cycle. i just finished 3 weeks so far of 50mg each per day. I've put on 5 lbs, plus i've cut up nicely. I'd say i've put on more like 8lbs of lean muscle. So yeah, you should be able to gain 10lbs on it in a 7 week cycle.
I'd reccomend taking creatine with it.