I'm sipping some Old Overholt on the rocks right now; I keep hoping I'll learn to like it. (Chuck, I'm on the verge of agreeing with you; the taste that I don't like reminds me of a mouthful of Big Muddy River water, a comparison I had never thought of until you mentioned "mud".)
As I started to take my first sip, I was struck by the similarity of the nose to that of Old Grand Dad BIB. I know that bourbon has to be at least 51% corn and rye has to be at least 51% rye, but that opens up an interesting possibility. For all I know, the mashbills for OH and OGD could be extremely similar, say on the order of 51/44/5 (corn/rye/malt) for OGD vs. 44/51/5 for OH.
Does anyone know the mashbills for these two whiskies? I'm guessing that they are not all that close. I actually like Old Grand Dad a little bit.
Dang, I can't finish this stuff. Maybe a little EC12 will get the taste out of my mouth.