Montana is indeed a great place to be a craft beer fan, especially with breweries popping up in many small towns like Lakeside, Stevensville, Wibaux and places in between. Glacier Brewing sits up the hill from downtown Polson at the southern end of Flathead Lake. I've always wondered why Polson doesn't have a Dairy Queen, but that's a different story for a different blog.
Tamarack's Vanilla Bourbon Stout and Blacksmith's Pulaski Porter aged in bourbon barrels and enjoyed both of them. Judging by the name, it appears Glacier started with their Slurry Bomber Stout, a dry, sweet stout, and aged it for four months in whiskey barrels.
The Abyss, the most complex and highly treasured whiskey barrel stout made and the timing probably wasn't good for a comparison. They aren't intended to be the same style of beer, but the mind often gets in the way of a fair consideration. If you've had Glaciers' Bomber Barrel Stout, I'm curious to know your impressions. Remember, its all relevant.