The result of your conversion between shot and barrel [UK, wine] appears here
To convert between Shot and Barrel [UK, Wine] you have to do the following:
First divide (0.000016387064*231)/128 / 0.00454609*31.5 = 0.00020652
Then multiply the amount of Shot you want to convert to Barrel [UK, Wine], use the chart below to guide you.
Symbol: shot
No description
Symbol: bbl
No description