There has got to be a better place you can save a buck than cheeping out on anchors, Tradman. They may pass your ad hoc testing, but I want extra beef to leave plenty of leeway for variable quality control and wear. Plus, the bigger radius is better for your rope. I can see using 3/8" instead of 1/2 to save money (not to mention carrying the beasts), but 5/16 is cutting it close IMO. I know it is sacrilege, but I would drink one less beer and stick with the bigger ones.