FWIW, K&L is offering the following:
Four Roses K&L Exclusive OBSO Single Barrel Cask Strength Bourbon 750ml, which they describe (in part) as follows:
" . . . our second batch of OBSO (a 60% corn mashbill with a healthy dollup of rye and yeast strain "O"), we were hoping to recreate our previous whiskey, which we lovingly called "the iron fist in a velvet glove." What we got, however, was something far more powerful and out of control than we ever could have imagined. I would refer to this whiskey as "the iron fist that just punched you in the mouth" because this Bourbon is a beast! At 63.3%" abv.
NO affiliation with K&L, other than as a customer. Haven't tasted this either; just presented for your information.