How much grain is enough?

[victor]

Hello all!! I’ve been trying new recipes I’ve found on this form and found one I like and its a modified version of ujjssm that I made, that I’ve been sticking with for sometime now. I love bourbon and I saw the honey bear bourbon recipe and I want to give it a try. I don’t want to do an all grain batch, adding sugar is ok with me! So my question is how much grain would be enough to get the flavor from the recipe without the grain/mash bill that it would take for a 40 gallons? Thanks in advance!