Barton Reserve is shown as 70% neutral spirits on the Barton website, the others (I only took at quick look) at 20%.
It is possible though too whomever was writing what I recall reading was referring also to the Bourbon - A Blend category, which are half bourbon. One of these is shown in the same (blended whiskey) part of the site.
As always, taste tests are needed, the next time in Kentucky I'll look for some and see how they stack up.
Taste tests indeed Gary, you have piqued my interest in Barton blends, I'm confident I can find a few around here.
And no Chuck, I have no high expectations but am interested looking into American blends that in a highball might please my non whisky drinking social friends.
Interested in blends? Make your own! Use good bourbon and good vodka and I guarantee you'll like the results better than anything you can buy. To approximate the typical American blend use four parts vodka to one part whiskey.
Tried that with mixed results but I was looking for a richer taste profile. Now I would like to see what the professionals are doing.