One of my best-ever bourbon vattings is a combination of Henry McKenna BIB (the current SB) and Buffalo Trace (the current release).

It was done 50/50 each with perhaps a bit extra of the McKenna added. I did however bring the McKenna down about 10 points ABV before doing this, to align it to the Trace that way.

The result is remarkably good, for once words fail me.