Two things you have to remember about blanks. one is make you clean whatever gun you shoot them as is they were corrosive primed. They will cause rust to form anywhere the gasses have come into contact with. Second, do not ever use the blank powder for reloading cartridges. it is extremely fast burning and it's only use is to provide enough pressure to go bang. If you reload cartridges with blank powder you in effect have made a grenade. So don't think about it. Now as far as a price is concerned if they were made in the late 50's there is a good chance that some of them are corrosive primed. If loaded in the 60's then they are non corrosive and ok to shoot. Maybe for the ones in the 60's you could get 25 cents apiece. Or donate them to your local VFW,Ameriacan Legion,Vietnam Veterans Halls. They can use the blanks for salutes at graveside funerals, and salutes. Frank