A good friend of mines brother owns a sucba school with a pool. Well 3 pools. One is 6 ft deep after bsing with him he came up with an idea to submerge 2lt pop bottles at different depth. Well I have a 11yr old son just started in archery. Pick him up a buckeye jr and set it for bowfishing. To shorten up story the kid is excided he fine after 30 shots hit a bottle. After that he was dead on.