**********We hear use what is called crush and run, 3/4" blue stone with some kind of filler and it works very well. We have lots of hills so about every 4-6 months it has to be scraped back up. My driveway is 200' and after 7 years I just had to lay down another 6 tons and could use some more. Some nut:howdy: planted trees so the big 25 ton truck can no longer make it to the driveway so I have to buy it in smaller loads. Price was $18.50 per ton.
Stone dust is the 'filler' in the 21 A or B (which is crush/run) that you are talking about...the dust , when wet--is what adheres and holds it all together....You want the big stone on the bottom--then the base wil eventually sift down thru it....
Different names in different areas.....:dunno: