RE: IBO HC site rules
A compound, recurve, or longbow with or without sights, may be shot with release aid, finger tab, glove or bare fingers. If a sight is used it will have no more than four (4) fixed or crosshair style pins. Circle pins allowed if all circles are the same size. Arrows must have screw in style points and a minimum of 4 inch vanes or feathers. Only one (1) single stabilizer being less than twelve (12) inches in length from the nearest point of attachment is allowed. A maximum of eighty (80) pounds of peak weight is allowed and will be shot from the yellow stake with a maximum of 35 yards. * - **
This should help you with your grains question...<img src=icon_smile_big.gif border=0 align=middle>