As of today, Bullseye North changed the description of M67 to "corrosive". Three weeks ago I bought a 1120rds case believing their advertisement that it was non-corrosive ammo for shooting it in my bolt-action Ruger Ranch and Howa Mini Action. Description on my ammo case shows production in December 1980. The cartridges look pretty good, brass cased, although they are Berdan primed. So, a bit difficult for re-loading. In the meantime, I've watched several videos on YT and most say that it is quite accurate ammo. The price per cartridge comes to 91 cents/rd with HST. It's still about 50-60 cents less per cartridge than a real non-corrosive brass cased ammo like PPU, PMC Bronze and Sellier&Bellot which is nowadays around $1.50/rd. I guess I'll keep it and see how it shoots.
P.S.1. The whole story is funny. I just talked to their manager. He says that M67 ammo is "non-corrosive" and some new hired person made a mistake by changing the description on the BN website to "corrosive". He mentioned that he made a "nail test" on the ammo and it came out as "non-corrosive". He is going to do more research about that ammo and will get back to me. So, I'll see.
P.S.2. The end of the story. The guy from Customer Service BN called me back and said that the M67 batch which is now on their website is CORROSIVE! They e-mailed me, right away, a return label for UPS so I will return it just to be on a safe side.
Bastards.
When I emailed them to see what the date of production was they said it varies, and there were no markings on the crates.