See blue link below for the excellent fiche technique/technical note from the winemakers at Charles Smith.
Charles Smith Boom Boom Syrah 2017 - fiche technique
In the maker's words: Boom Boom! exploded on the wine industry in 2007, and this spicy Syrah has been one of Washington State’s signature wines ever since. It’s a tribute to Charles’ first love lost—a woman nicknamed “Boom Boom” O’Brien—and it’s one of the biggest and boldest Syrahs of all time. It’s not surprising that wine drinkers everywhere have fallen in love with it.
More conventionally expressed: This wine is made by Charles Smith, a self–taught winemaker who brings his rock and roll spirit to the vineyards of Walla Walla, Washington. As a romantic young man, Charles Smith moved across the world to Denmark to follow his love for his girlfriend at the time. In Scandinavia, he became a recognized manager for rock bands such as The Raveonettes. While travelling on the road with these bands, he developed his passion for wine. In 1999, he moved back to Washington, opened a wine store and became friendly with a French winemaker, later convincing him to move to Walla Walla to make wine together.
99% Syrah, 1% Viognier.
Aromas of fresh picked herbs and wet earth. Rich black cherry and tobacco are followed by hints of lavender on the finish. An explosive dark cherry bomb! We'd agree with other tasting notes we've seen that read, "blackberry, boysenberry, dry-hung meat, white pepper, savoury herbs". The "crushed granite" bit... not so much.
ABV = 14.5%.