I recently acquired 4 boxes of these Finnish repacked Soviet ShKAS API rounds and have been doing some research on the history of these. Fascinating history but I have also noticed a fair bit of conflicting information on whether these were safe to shoot out of rifles or not. Some say these were great sniper rounds and are loaded to higher standards because they were specifically for use in aircraft where you don’t want to have to deal with a malfunction/jam. Others say it will cause the bolt to stick because it’s higher pressure than standard ammo making it unsafe to shoot, and definitely don’t shoot out of svd’s. Because of the higher pressure I also read ShKAS rounds were made with thicker primers cups and case heads. I wonder if anyone here has any experience with these and what the consensus is about firing these out of a rifle?
Here’s a link with a great article about the ShKAS machine gun and the ammo developed for it: https://www.forgottenweapons.com/russian-shkas-aerial-gun/
Pictures of 2 of my boxes, one opened, one still sealed:
Youtube video of these actually being fired: