Lift Powder grain size OD

Hi there,

         I would like to use Black powder from commercial source for
shooting small shells to large shells.I requested the supplier to be
supplied at the size of "mustard" I am sure it will be burn must
faster and sometimes it will be fatal to the mortars that will blow
away easily.Does anyone able to exactly specifies the grain size
roughly?Please don`t mention FFG or FFFG since we live in different
countries i don`t know what u are using there.Hence,Please tell the
grain size must be in mustard or double than mustard size? Botonical
expression will help to understand easily!


Cheers,

Indian Pyro