Testin' an aluminum 15-inch diameter tank t' its burstin' point, shot at 300fps. Begad! This one gives way at 460 PSI. T' point o' a test like this is t' see if t' test tank would meet our needs in terms o' how much it weighs vs. Avast, me proud beauty! how much pressure it can hold, ya bilge rat, and what margins we'd have t' stay within t' safely use it on an actual rocket.