OMG dude... dont use that much sugar. You're gonna end up with 15% cider!!!
2# of dextrose in 6 gallons of AJ put me to 1.063. This should ferment down to .998 give or take. That puts it right about 8.5% ABV (OG-FG*131)
As far as the exploding comment, Montrachet does not create much if any krausen so you should be good filling the carboy up. Just keep the airlock outta the sauce cause this stuff offgasses like CRAZY.
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