I've done a bit of it out of my .56 caliber gonne. I use a 3/8 or 1/2 inch birch or hickory shaft about 7 1/2 inches long. I split the back end of the shaft and put in a triange of leather for fletching then bind the split back together with a bit of linen thread. Points have ranged from modern glue on feild points and broadheads to some mideval style bodkins. To shoot them I load a reduced powder load (25 grains of fffg) with a wad (cloth, leaves, tow, whatever I have handy) then twist the leather fletch around the shaft and push it down over the wad. Fire as usual. They work pretty well and for me seem to be more accurate than a lead ball. I can usually hold a 6-8 inch group with them at 25 yards. They are also pleanty powerful, I have shot them half way through a 4x4 pine post. In fact I was thinking about taking it out after a deer this season.