This is a topic that comes up frequently in the fly shop where I work and every other fly shop I have worked in and on many fishing trips etc. so i figured i would mention it. There are a lot of sinking lines out there these days, sink tips, full sink, integrated shooting, sink tips with intermediate running lines and everything in between. Something that comes up that seems to be one of the most confusing aspects of this is the grain weight of these lines and how that relates to the sink rate. Contrary to what a lot of people think, grain weight doesn't always equate to sink rate. It does play a role, but it does not dictate the sink rate. Some of the original sinking fly lines were made with only grain weight as an indication of how fast they would sink and some still have only this today so this is what causes a lot of the confusion. Grain weight is simply the weight of the line and if the line is made out of a less dense material then it won't sink as fast or if it is made out of a floating material it won't sink at all (at least wont sink much since we all know floating lines will sink). The grain weight is primarily used to determine how the line will load the rod. Most lines now come with a sink rate and a grain weight and the way to look at it is to look at the grain weight to match it to your rod and look at the sink rate to determine how fast the line will sink. Almost all lines these days will have the sink rate on them in ips (inches per second) which is also frequently listed as a "type" such as type 3, type 6 etc and these correspond to the ips, so a "type 3" has a 3 ips sink rate and a "type 6" a 6 ips and so on. Anyway, just wanted to bring this up since it seems to cause so much confusion.
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