After PR 280, PR 391 becomes a two-lane gravel road through the uninhabited portions of northern Manitoba. The route runs northwest and west for various points until reaching the area of Mooswuchi Lake.
Following PR 280, PR 391 transforms into a two-lane dirt road traversing the uninhabited regions of northern Manitoba. The route proceeds northwest and westward to various destinations until it reaches the Mooswuchi Lake area.