I have been doing some research on lines and terminology and after looking at Rio
's understanding fly lines pdf document I think the Skagit is the way to go and then a set of MOW tips for fishing through the water column (something that I haven't seen done on the Miramichi, most use floating lines).
Now most of the fly fishing I have done has been for small Steelies and saltwater Brookies on PEI. I almost always used a nymph rig with and without an indicator with and without weighted nymphs and splitshot. (Something not allowed on the scheduled rivers here in NB, don't agree with that but that is another matter entirely). I have figured out some different roll type casts which after reading up on spey casting I have come to realize is just spey casting with a single handed rod. This is very good for me!
Now last fall in the Miramichi Area I was fishing with some fellows using switch rods but they were using fly lines made for single handed rods. Now they could cast overhead very well but they couldn't roll cast because the rod wouldn't load well. (Spey lines are very different from single lines). I was using my trusty mid-action 5wt for some salmon fishing (hooked 17 salmon in 15 days and only landed 3 grilse and two small salmon because of the small rod with no backbone, was hella fun though).
Anyway I was using a 12ft 7-9 ips sinking tip plus a 10' leader and I was able to consistently able to hit between 50-60' doing some fancy roll casts that started down stream then crossed over my body up stream, then I would do another quick roll cast without the line touching water, then I would let it shoot out across from me and the fly would just flip out on top of the water(hard to explain). I would usually have 10 - 15' stripped in that would shoot out through the guides. I just loved doing that cast but it could be dangerous and a few times I would be ducking to miss the fly on a poorly executed cast. The fellows fishing besides me were giving me many compliments on the cast. If spey casting is as much fun as that(I think it will be) I am gonna have a blast.
My only question as I will be fishing on PEI with nymph rigs as well, will the skagit line be wrong for that type of fishing? I am getting the switch mainly for salmon fishing but would like to give it a go on some of the bigger estuaries over there.