when I bought my Delta Elite (more than 20 yrs ago) I bought factory ammo for it, as I had no brass to load. Back then, 10mm was very hard to find..anywhere. That was the last time I bought factory ammo for one of my firearms, as I had no cases to load. After some time, Midway had a sale on Norma 10mm ammo & I bought a supply, came in 20 rnd boxes. I still have most that ammo. I guess it was a close-out sale, as Norma stopped making ? selling ? 10mm ammo around that time. No idea if they started selling it again, after 10mm started gaining in popularity.