Volga Bulgaria had its capital about 30 km south of the confluence of the Kama and the Volga, while Kazan (currently capital of Tatarstan) is about 40 km north of the confluence. 
Volga Bulgaria was devastated by the Mongols. Modern Volga Tatars do not descend from the Volga Bulgars, but in part from eastern migrants in the 13th and 14th centuries who arrived under the Golden Horde. Chuvash probably have some Bulgar ancestors. journals.plos.org/plosgenetics/a…
Suspect that significant amount of ancestry of modern Volga peoples was there 4000 years ago. R1a-Z92 (sister to famous Indo-Iranian R1a-Z93) still found there, along with a lot of Corded Ware-like ancestry, in spite of Iranian, Finno-Ugrian, Turkic, and Mongol conquests.
Though repeated pulses of Corded Ware ancestry from Steppe Iranians can't be ruled out. I think this happened slightly for Udmurts - a couple of percentage points of their ancestors might have been Sarmatians.
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