1 out of 1 members found this post helpful.
Re: What's the difference?
I doubt that you're going to find too many of us who routinely weigh our flies... Unless all your flies are otherwise identical, the weight isn't a good indicator as to how it's going to behave in the water.
A while back Matt posted a Chimera Caddis pupa fly, that wasn't much more than thread and floss. It's quite light, but sinks well enough so I've never felt any need to add any weight.
Back in my "bass bug" days, I used some very large/heavy, deer hair, cork, or balsa, flies, that were quite heavy, but floated.
Specific gravity might be a better scientific criteria, but most of us just rely on experience, (and the occasional split shot).
1 out of 1 members found this post helpful.
Re: What's the difference?
I don't have a scale that accurate and I've pretty much gone to just bead heads for my weighted nymphs so they're fairly easy to determine which is heavier. There is going to be a difference the heavier fly will sink faster depending on the type of water you're fishing. Since you're weighing them just separate them by weight in your fly box. Leave an empty row between the different weights. If you're fishing nymphs you need to fish them as close to the bottom as possible. The faster and deeper the water the heavier the nymph you'll want to use.
Or Donuts!
Islamberg in Catskills