And here's some info on another Finnish sniper during the same conflict:
During 105 days of combat Suko was credited with 400+ enemy kills as a sniper in the Winter War (30 November 1939 14 March 1940). He used an iron sighted Mosin-Nagant rifle. He often took the war to the rear of the Soviet lines, causing much fear and frustration as this area was supposedly safe. In addition to the kills he made as a sniper, Kolkka also was apparently quite fond of the submachine gun as he made an additional 200 kills with it during this same time frame. Hunted often by the Soviets, he outlasted them all, killing the sniper sent to hunt him at 600 yards with a single shot after a running duel of several days. Like Simo HÃ¤yhÃ¤, Suko Kolkka exhibited the hard determination and skill that kept Finland a sovereign nation even after its inevitable defeat. At the end of the Winter War a Soviet General is said to have quipped, "We gained 22,000 square miles of territory. Just enough to bury our dead".