Unusual WW2 Finnish Ammo Box - Opened and Tested

A viewer named John donated some rare and unusual ammo for us to test out. This is Finnish 7.62x54R, and was captured from the Russians and re-used. The condition of these were pretty rough. Bullets that were not fully-seated, dents in the cases, and very grimy. Will these even function after over 80 years stored in just a cardboard box? John did mention he believed these were used for the ShKAS MG.