MONO running line size - Spey Pages
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post #1 of 11 (permalink) Old 03-10-2019, 04:03 PM Thread Starter
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MONO running line size

I have made the change over to 100% mono running lines and love the advantages. From a casting efficiency standpoint only, is there a general rule of thumb regarding the size of the monofilament relative to the size rod or grain size of the shooting head?

Example: use 30 pound for 4-6 weights, 40# for 7-8, etc.

This is more of a question of casting efficiency and distance and not breaking strength relative to leader.

I’m pretty sure that if I put 150 grain OPST commando head on my single-handed three weight with 50 pound laser line that it would be pretty difficult for that head to pull the loops through the guides. The goal being to use the most efficient size mono running line. Obviously, the larger the diameter the easier it is to hold onto in wet conditions.

Hope that makes Sense
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post #2 of 11 (permalink) Old 03-10-2019, 04:26 PM
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I use 40# Big Game on 6wt and up. So far, 25# Amnesia on my 3wt trout spey & single handers. The Big Game is slightly larger than the Amnesia by visual inspection. I haven't mic'd it though. I need to try the Big Game on my trout spey though... I'm having trouble with the rear end of my scandi head overrunning the tip & leader. I'm hoping that heavier shooting line will help turnover without losing any distance. Anyone have any thoughts on this?

-Sean
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post #3 of 11 (permalink) Old 03-10-2019, 05:38 PM
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I have 30# Stren catfish mono on my 4wt trout spey with a 300 grain head and have also used 30# OPST Lazar on it, both worked well. I have also used the Stren catfish mono in both 30# and 40# on my 6wt switch rod with 330-360 grain heads and also tried the 40# Lazar. Again, they all worked well but the 40# Stren catfish I think would be better suited for head weights above 400 grains. Your example seems very close but head weights and individual rods may play a bigger role in the 4 to 6wt area.

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post #4 of 11 (permalink) Old 03-10-2019, 07:49 PM
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My thinking, for what ever it is worth, is 30# on my little rods up to 6 weights, and 40 on my 7&8 weight rids for full floater use. For tip use on 7 and above I use the 50# as I want the extra cushion against breakage on hangups. I do use 50# on my 10 weights though regardless of line type.

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post #5 of 11 (permalink) Old 03-10-2019, 08:08 PM
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I use 40lb on my 6 weight and on up

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post #6 of 11 (permalink) Old 03-11-2019, 02:57 AM
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The key for my casting is to have a running line that creates sufficient drag to slow down the heavy rear taper of the head so as not to allow it to overrun the front and cause the line to pile up. I use Sawada 35 on my 500 to 600 grain Next lines. I use Sawada 50 for my 625 to 725 grain Nexty king heads. I prefer the flat beam to the round as I think it's a bit easier to hang on to. I prefer the solid to the hollow as I believe it kinks less.

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post #7 of 11 (permalink) Old 03-11-2019, 02:04 PM
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Topic is well covered in Speypages history and above. FYI here is my experience even so it is repetitive. You may find some details of interest:

Have been using mono running line behind a 30 ST-10-S shooting head for my traditional SH fly rod since before Amnesia and subsequent flat mono became popular. Smaller diameter gives a little more distance depending on your style. But, tangles are more frequent in spite of my attempt at good coil management techniques and not stripping more mono than you need. For me, 30# seems to be a good compromise & helps recover your head & Sink tip when snagged provided tippet is the weak link. Mono is used on my Skagit Rod. Efficiently stretching mono running line around a tree (not your hands) just before you wade in and periodically during breaks, has worked best. It is suprising the difference it makes. I have specifically experimented with Big Game, Maxima Ultra Green, Amnesia, Slick Shooter, Varivas, etc. Bottom line for me: Thin fly line is more enjoyable as a running line. For example, l love my full WF floating line with a sink tip. However, I am not the best fly caster when it comes to distance. On the larger rivers, mono gives me that extra distance without the resultant belly mending. That extra distance has made the difference when they roll on the far bank.
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post #8 of 11 (permalink) Old 03-11-2019, 02:28 PM
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Just loaded my reels with mono (OPST Lazer) Ed Ward spends some time at the end of this video discussing mono running line size and I found the whole video valuable. Cheers, Chris

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post #9 of 11 (permalink) Old 03-11-2019, 07:17 PM
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Thanks Cbtrtbum.
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post #10 of 11 (permalink) Old 03-11-2019, 08:57 PM
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I just measured these on my reels.
Big Game 40#. .024
Big Game 30#. .022
Amnesia 30#. .024
OpstLazar 40#. .022
I am using the BG 40#, Amnesia 30#, and OPST behind heads 475 gr to 575 gr.
The BG 30# for everything less than that although I have a small 3wt that I will probably use BG 20# or something similar, maybe Amnesia 20# which I have already.
I like the Lazar because it floats and coils less than BG but for some reason the Big Game 40# seems to offer less resistance in shooting for distance. I have no idea why that would be.
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post #11 of 11 (permalink) Old 03-11-2019, 10:05 PM
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I would think it has more to do with what you're hunting than rod length/size, but that's just me.

I also never load my reels with anything stronger than I just put on. In other words, the backing and running lines are my strongest, getting weaker as I reach the tippet. I hate losing heads and tips, but I'll lose a fly and leader any day!
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