Hey Dave, Daryl reasurred me that the 5/16ths shaft would be plenty and I didn't argue since he's the master speargun builder and I'm not...
Happy to hear the same thing from you too. Rigdvr uses a Wong and basically told me the same as well.
Years ago I had built a long JBL with a 5/16ths shaft and put three wraps of Riffe mono and a wing tip trying to reach out for big snapper. I would hit them but the penetration wouldn't happen. Our bands (we would buy in bulk and make our own) didn't have quite the elasticity as the Riffe and Wong bands. They had a hell of a snap though. I still haven't fired a stronger gun for short range hunting than a beefed up JBL. Now, I'm a few years slower and the fish are a few years smarter so long range it is!
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