i have a quantity of them and no berdan primers and want to shoot my 10 gauge sxs dbl. question everbody says to drill them out with a 15/16 inch drill to except 209 dia primers but no one says how too do it. when i tried the drill runs off to one side or the other and ruins the shell, to darned hard to come by to ruin. could some one please run me through it? thanks in advance, toot.