On the Swift, really, smaller is better. At least if midges are the fly of choice. Believe it or not, I caught 90% of my Swift trout without using fly smaller than size 24, but just last year I began experimenting with 28-32 sized flies.
And I wish I had done it earlier, because I caught a lot of fish on them.
Now I do still think it’s a misconception that you need to use flies that small to consistently catch fish there. For most of my trips to the Swift, I caught plenty of fish without them. Streamers, terrestrials, worms, eggs… all produced for me. Even just size 20-24 zebra midges. (Thing was, I used the lightest line I could find with these (equivalent of 9.5x), and I didn’t seem to need to go to a smaller fly. Personal preference; I’d rather fish light tippet than a tiny fly.)
But there’s no denying that the size 30 flies work. What I liked most about them is that it made it possible to consistently catch fish on top at the Y-Pool. That combined with the ultra thin tippet I used led to some good times.
But what I want to talk about is getting flies this small. No fly shops around MA, or any fly shop I’ve been to, really has any flies smaller than size 24. So there’s really 2 options… tie or buy. But even these options are limited.
The only place I know you can buy size 32s is Tenkara Bum. Hooks this small are pretty pricey compared to what you probably usually use, so use them wisely.
You can also buy tied midges from Fly Shack. These are very cheap for flies, and I don’t believe shipping is that much. I’m not a big fan of these online, overseas fly shops, that produce flies for extremely low costs (for a number of reasons… quality being the biggest), but I make an exception for Fly Shack. While they don’t have size 32, they have a few flies down to size 30, which is pretty good.
I’ve been saying for quite a while now, if someone started a website/blog selling just Swift flies down to size 32, they would be in the money!