Depends on your hunting neds
Hello.
Here is my 20 cents
I like to use as much reel line as possible!
Why?
Because if I meet a big pelagic fish I dont have to think twice about spearing it. :t
There is no such thing as too much reel line
Not only is extra line great when fighting bigger fish (and wait till they loose some fighting power), but also when landing not perfectly shot fish.
Since you can give them more slack, so they dont tear the spear out.
As my friend likes to say 50 m is the maximum lenght for most med spearos, but I personaly use 100 m of 1.7 nylon enclosed Kevlar line with a 10 m 1.7 monofilament shooting line, attached to the reel line with a swivel (80kg test).
So far it worked great for all kinds of fish.
If I hunt for smaller fish I use just the mono shooting line ,and if I encounter biger fish Iam never hesitating with the shot, since I know that the fish wont take my gun
)
I also always dive with a bouy so in case of last resort (hasnt happened yet ) I can clip my gun onto it.
A factor in my decision for a biger reel with more line was also the fact that I (in general) dont like to swim in bouy line spageti marinara (attached to my gun).
I know that some people will say that biger reels mean more drag, a heavier gun, etc....
But it all depends on how you choose your reel , line, and how you execute the reel setup and gun balance.
I also get comments on the line and swivel (that its overkill)... but let me say...what good is a spaered fish if you cant land it succesfully?
Just for the record ...Kevlar lines will break (first hand experience), 1.7 mono will snap (if the fish is hard fighting), and special cold pressed INOX spring steel spears will snap (if the fish does the right thing
).
And so there is no mistake, we are not talking about 200+ kg tunas, but regular med fish.
I think it all comes down to the situation you find yourself in, but as rool of thumb i would go for "Better safe (more reel line) then sorry.Hope this helped.
See you in the sea.
Spider.