How much weight should I add to my speargun? I figured I'll ask about balance in a separate thread.
I'm used to having guns that sink with the shaft in / float with the shaft out, and that's the way I prefer it. But I haven't paid much thought to how quickly I want the gun to float (without the shaft). My understanding of ballasting as far as weight is; to keep adding weight until the gun starts to sink (shaft out) then take off just enough weight to make it float again. I built a gun with a stock that has similar dimensions to a Riffe competitor series stock. I was surprised to see that adding 11oz still is not sinking the gun (maybe because it's a solid piece of teak and has no epoxy). I'm not even sure I have room to put 11oz, I will have to drill many holes as the stock is slim. How do I figure out how much weight should I add?