Situations where Finnish police result to using their firearm are rare to begin with but you can just google it and find several articles with examples of this. However I can’t find any source on how police are instructed to act when it comes to using deadly force.

Since 2000, ten people have died as a result of use of force by law enforcement officers in Finland. This includes a prison guard shot by accident during a training exercise, and a detainee who died of undetermined causes after being fired at with a taser.

Source

Poliisi ampuu ihmistä kohti vain noin viidessä tehtävässä vuosittain / Police shoot towards people only about 5 times a year.

Miljoonasta hälytystehtävästä ampuma-asetta on käytetty vuosittain vain noin kymmenessä tehtävässä, ja niissäkin kohdistettu laukaus ihmistä kohti on ammuttu vain puolessa tapauksista / Out of a million emergency calls, a firearm has been used in only about ten incidents annually, and even in those cases, a shot aimed at a person has been fired in only half of the situations.

Source

EDIT: Another example EDIT2: And another