The result of your conversion between Dram and barrel [US, federal] appears here
To convert between Dram and Barrel [US, Federal] you have to do the following:
First divide ((0.000016387064*231)/128)/8 / (0.000016387064*231)*31 = 0.0000315
Then multiply the amount of Dram you want to convert to Barrel [US, Federal], use the chart below to guide you.
Symbol: dr
No description
Symbol: bbl
No description