A book on early XX century political terrorism in Russia by US-based researcher Anna Geifman gives estimates on the number of government officials (from the lowliest clerks to high-ranking generals and other dignitaries) killed OR wounded in terrorist acts after 1905. She states that in just two years after the failed 1905 revolution, over 4500 of them were killed or injured. During two and a half years from early 1908 to summer 1910, she cites the official numbers of nearly 20000 terrorist acts and expropriations (robberies and bank heists ostensibly to finance political movements), in which 732 officials and 3051 civilians were killed, with 1022 and 2829 wounded, respectively.

A paper dedicated to the terrorist campaign of Socialist-Revolutionaries (one of many revolutionary parties in pre-Revolution Russia, a very large one, and one that probably had the most active and notorious paramilitary terrorist wing), states that one of the most prominent terrorist acts in Siberia in that time by the SRs was the "daring and brutal" assassination of Akmolinsk governor* Nikolay Mikhailovich Litvinov, carried out in the city of Omsk, shorty after the governor was appointed.

The assassination was carried out by the "Mobile (lit. Flying) Fighting Squad" of the SR Combat Organization. Governor Litvinov was ambushed while walking to work, crossing the street. Three people approached him riding in a horse-drawn sled; all three opened fire with Browning-type autoloading pistols. One of the terrorists jumped off the sled and placed several shots into the prone governor to be sure. The killers then sped off, pursued by several coach drivers and a cossack on horseback. The terrorists then shot dead a street policeman (gorodovoy) who tried to stop their sled, abandoned the sled, shot a shop manager who also tried to stop them, wounded the cossack who caught up to them, and successfully faded into the frightened market crowd. The alleged reason for the "sentencing" and the assassination, stated in a pamphlet announcing the responsibility of SRs for the act, was that Litvinov had earlier crushed down a peasant rebellion in Stavropol Governorship. The perpetrators were never found.

I realize this is maybe not the right governor or the right terrorist act (or it was conflated with something else in the memoirs of Maria Bochkaryova... or they indeed housed a lucky escapee!), but I wanted to find at least something and give you some context of what the revolutionary terrorist was like in that period. Searching through Geifman's book, I only found successful attempts on lives of governors in Ukraine, Belorussia, and Central Russia. Governors and general-governors were big fish in Russian Empire and apparently terrorists didn't kill that many of them. Although they nabbed a prime minister, the very first one in Russia (he was a hardliner but a reformist). Pyotr Stolypin survived 10 attempts on his life and was killed by the 11th.

Anna Geifman, Thou Shalt Kill: Revolutionary Terrorism in Russia, 1894-1917, 1993 Princeton (I used the Russian translation which I had access to)

E. R. Kadikov, Terror of the Socialist-Revolutionaries in Siberia at the Beginning of the XX Century // Herald of Omsk University 2016 No.1 (in Russian)

* Akmolinskya was an oblast, or territorial district of the Empire; it was one of the largest Russian districts in Central Asia, the size of Greece and was home to 200 thousand people. It covered what is now the entirety of Omsk oblast (subject of Russian Federation), and a large part of Kazakhstan. Governor lived in Omsk, since it was de facto the most developed city there at that time, and became the capital of the district since.