I don't know of a chart or anything but my question is why foot an aluminum arrow with another piece of aluminum. Most people foot carbon arrows with pieces of aluminum shaft to keep the carbon fibers which are woven to create the shaft from splintering and mushrooming where the insert goes into a shaft. I haven't shot that many aluminum arrows but the ones I have shot seemed extremely durable to direct blows to the point end they just bend easy if a glancing blow. Hence the reason for carbon shafting it is much stronger if a glancing blow is struck and if footed with aluminum as strong or stronger on a direct blow to the point end. Another way to make durable arrows that won't mushroom hardly at all with carbon arrows it to use a brass insert. I have done quite a bit of stumping with carbon arrows and brass inserts and find them to be nearly as durable as footed carbon shafts and only break about 1 or 2 more a year.