I dry hopped this beer using pellets in the secondary, 2 weeks before kegging it. I had two carboys: Did one with cascade, and one with simcoe.
The hops react violently with the beer, and cause a terrible blow off, so next time, be sure to have plenty of headroom in the carboy. The hops do not settle out very well either, so I'll probably use a hop bag next time, and do them in the keg, and remove them before carbonating it.
When I racked from the carboy to my first keg, I just siphoned it normally. Lots of hop residue int he beer in the keg. What a mess. I hope if settles in the keg and gets pushed out the dip tube int he first several pints, and then is gone. For the second carboy, I siphoned through a super fine hop bag, and it caught all of the residue. Whew!