The organic PacGem I use is described by seller Seven Bridges (breworganic.com) as follows: "Pacific Gem is a very high alpha hop with a pleasant citrus aroma good for bitters and dark beers. Some brewers have reported that Pacific Gem provides a subtle "blackberry" flavor/taste, which is a popular characteristic for English bitters and stouts. With its good clean bittering character, Pacific Gem is a good substitute for Magnum, Millenium, Nugget, or Columbus hops."
Up until recently I've only used it for FWH additions. Just dry-hopped a 2.5 gal dark sour with an ounce of PacGem, which from the description should tie in well.