I've got a pretty good idea about ingredients surrounding an imperial pumpkin ale I'm trying to clone. The big question I have is surrounding the FG of the beer itself. I'm trying to get the same mouth feel. Could I just open a bottle of the original, let it go flat, get it to around 60 degrees F and take a gravity reading. Has anybody done this? and if you have does it give you a pretty accurate reading? 
I figure if this works I could build backward from there to get the approximate grain amounts based on the ABV of the beer.
I figure if this works I could build backward from there to get the approximate grain amounts based on the ABV of the beer.
