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Discussion Starter · #1 ·
I've noticed confusion with line ratings for rods described as a 'switch' rod - it seems some makers use single hand line ratings while others use spey line ratings.

Is there a formula, or even a suggestion, for what percentage of a D-loop's weight is loading the rod - i.e. 60% of the loop ? When I read formulae for building Skagit style lines it does seem that the line (less the sink tip) is being built to match the Spey grain rating for the rod. If that is the case, is it not possible to do the same for single hand WF lines? For example, a single hand Windcutter 7 wt. might do as a line for a 5 wt. spey rod.

Can someone tell me where the double hand rod line grain weights are published?

Thanks for your thoughts!
 

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From Bruce Richards of SA

Spey Line Standards

Shooting Head
Head length 30'-50'
measured at 40' Short Belly
Head length 50'-60'
measured at 55' Medium Belly
Head length 60'-70'
measured at 65' Long Belly
Head length 60'-70'
measured at 80'
Line Weight grains/grams grains/grams grains/grams grains/grams

6 250/16.2 420/27.3 460/29.9 600/39
7 300/19.5 470/30.5 510/33.1 650/42.2
8 360/23.4 530/34.4 570/37 710/46.1
9 430/27.9 600/39 640/41.6 780/50.6
10 510/33.1 680/44.2 720/46.8 860/55.8
11 600/39 770/50 810/52.6 950/61.7
12 700/45.5 870/56.5 910/59.1 1050/68.2
 
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