Cant say that I remember a tried& true rule as to weather they would sink or float no matter how they were shot, some floated after thrashing around a bit others sank you didnt know until the event. But I do remember being up to my belly button or tits in slough water with the ice edge out 100 ft from shore many times feeling around with my bare toes for that furry feeling and grip it to start it to the top....all for a $30 buffer that we still had 8 hrs work on to get it stretched on a board....Wouldn't do that now for any amount of money...but back then that was how we financed our wine purchases and more .22 shells.