I agree with B&B on this issue!
The following is an excerpt from the August*September 2013 Eastmans Hunting Journal.
"California Blacktails:Genetic research has changed record book blacktail definitions and boundaries.
Genetic research by a team of California Department of Fish and Game biologists in 2006 was compiled in a document that states there are five generic clusters of deer in the Golden State and there are two distinct genetic blacktail clusters:the "northwest cluster" (these would be Columbain blacktails)and the "central cluster." The California Records of Big Game (CRBG) calls the central deer "inland blacktails."This cluster encompasses most of Northern California from the western edge of the Sacramento Valley, east to the Sierra Crest and from about the city of Redding, south to near Fresno.
According to the CDFW map (dna%20map) in the DNA document Columbian blacktails are limited, in the most part, only to the North Coast mountain ranges in the far northwest corner of the state, and do not extend east to Interstate 5 until near Redding. From there, their range runs east of I-5, up Hwy.299 and the Pit River drainage. The CRBG changed their blacktail boundaries in 2011 to reflect the new DNA evidence.
It is interesting that the Record Book for Washington's big Game Animals divides that state's blacktails into Western, Columbian and Cascade."
I talked with a state biologist back in the mid 1980's when I killed a big non typical in D-4, scoring 193 and some change. He told me the best way to tell if my buck was a blacktail or mulie, was to measure the metatarsal gland, located on the outside of each rear leg. If 2 to 3 inches, blacktail. If 5 inches plus, mulie.