This is my 1st all grain brew. I want to end up with 7 gallons pre-boil to end up with 6 gal. of wort. My target gravity is 1.066. I am mashing in a 10 gallon cooler. I am batch sparging with sac rest at 152 F and mashing out at 170 F. I scaled up the NB Dead Ringer IPA to 6 gallons and the recipe calls for 14.4 lbs malt. What do I put in the mash calc. for mash/water ratio? Do I use 7 gallons or 6? Thanks for your help. Mike K.