Re: What is the lowest tuning you can tune to with black winters
They will handle C standard or drop A# just fine. With proper string gauges, amp EQ and a proper guitar set-up you won't have to sacrifice much.. It depends on your scale length and how much tension you like. For C# standard and drop B, I use 54-12 heavy core strings (playing an SG). So you'll probably need 56-13 or heavier on your low strings
You'll have problems finding the right set of strings and having to make a custom nut and bridge saddles to host'em. The p'ups are the least of your concerns here.