[Mr. X]

I would take a medium sized gun as a compromise because we usually only take one in the water in the UK (for me in UK viz that means 75cm) & we don't get holed-up grouper. However, Spaghetti in the med. takes 3 spearguns with him on this float to handle the various situations he encounters; so you might consider getting a second gun & taking both on your float. A third alternative might be to get a small pneumatic speargun, perhaps with the acclaimed Mamba kit (for power & silencing?). You could then have a gun as short as your short gun & as powerful as your long gun -- I believe some hae a power switch to reduce the power for caves. Another option (perhaps not as good) might be to use a short or medium gun with 2 bands but only load a single band for caves.

If my calcs are correct you are talking about 60cm vs. 115cm shaft -- do you mean barrel tube length or spear shaft. If the latter, then both spearguns are very short < 80cm - so I would go with the larger. If the former, then see the paragraph above.