Moose are common in many areas of Russia. Much of Russia has terrain and climate similar to Canada. Notice the military caps and coats of the hunters. Like in America, it is common to use military surplus gear for hunting and camping in Russia. The guns they are using are shotguns, mostly double barrel 16 gauge.
Many people own such guns.
A common practice is to reload the ammunition. Usually full brass shells are used. This photograph was taken during the early 1980's. My father and my brother are among the hunters pictured here.