The result of your conversion between shot and barrel [US, dry] appears here
To convert between Shot and Barrel [US, Dry] you have to do the following:
First divide (0.000016387064*231)/128 / (0.000016387064)*7056 = 0.00025577
Then multiply the amount of Shot you want to convert to Barrel [US, Dry], use the chart below to guide you.
Symbol: shot
No description
Symbol: bbl
No description