Belzelbub
Contributor
With an enclosed track, you can kind of get away with overloading like that, but with a standard speargun, adding more bands can kill accuracy. It introduces flex in the shaft which leads to shaft whip that robs power and affects accuracy.I used to dive with guys who had the biggest guns they could find & used 2 or 3 bands at a time, including a ridiculously strong "grouper band" that I wasn't able to set. Then, one day, I watched a commercial spearo knock off half a dozen groupers in less than 5 minutes while free-shafting with just a single standard band on each shot & just using a medium sized gun. I learned more about spear fishing in that 5 minutes than I learned from the other guys in a couple of years.
The efficiency of those commercial freeshafters is definitely something. I'm nowhere near that fast, but get a little faster each time.
My gun has a muzzle that can support 3 bands. I only have 2 loaded, and really only load a single band. Second band is primarily backup in case one breaks. I also load that first band to the first slot leaving me the option of loading the second if a fish is staying just out of range. I don't have shafts bouncing off a fish. Keeping shafts sharp helps a lot.