Research tells me they are non-corrosive made by PPU in Serbia. $30 per 20 does not sound bad to me these days.Corrosive (primers) or not, congratulations.
If you can find it. I’ve been searching high and low for months, ever since l bought the gun. It came with 9 rounds which prevented me from firing it. The owner was my neighbor and good friend. I bought it from his widow. The store has 2 more boxes I will be buying.Back in 2018 when I bought my sporterized No.4, unbeknownst to me it came with 5 full boxes of mixed commercial ammo. I suppose now the ammo would sell for more than the rifle cost me!