510 lbs of silver bullion is how many cubic feet?

The density of silver is 10.5 which means it weighs 10.5 grams/cubic centimeter
Divide 510 lbs by 2.20462262185 to convert lbs to kilograms (kg)
Multiply that by 1000 to convert to grams
Divide that by 10.5 to find volume in cc's
1 cubic inch = 16.387064cc's (2.54^3cm) so divide last answer by 16.387064 to convert to cubic inches
1 cubic ft (12^3inches) =1728 cubic inches so divide last answer by 1728 to convert to cubic feet

Amount : 1 pound (lb) of silver

Equals: 0.0015 cubic feet (cu ft - ft3) in silver

http://www.traditionaloven.com/metal/precious-metals/silver/convert-pound-lb-of-silver-to-cubic-foot-cu-ft-silver.html