I recently brewed a Bourbon County clone recipe modified from:
https://homebrewsupply.com/content/HBS%20All%20Grain%20Recipes/AG_INS_BourbonCountyStoutClone.pdf
With my current set up, I can only handle an 8-gallon mash, so I used about 18 lbs of grain, 1 lb of table sugar, and 8 lbs of liquid...