what diameter dyneema should I use for my shaft line?

[burjegol]

Never have a problem with dyneema though. I use single wrap only for shooting groupers. I started to have tangling problems when using double wrap, shooting dentex or amberjacks.

 

[Spiro1996]

I would suggest 2mm dyneema because line wears down rubbing on reefs and general wear on gun.
And the day you shoot something big like a giant king, the line would make it more pleasant...
Just my opinion

 

[Spiro1996]

Never have a problem with dyneema though. I use single wrap only for shooting groupers. I started to have tangling problems when using double wrap, shooting dentex or amberjacks.

check out Rob Allens advice, just a thought