Well, then... that changes the options, doesn't it! Good news!

I did some searching hoping to luck out and find that article in .pdf form somewhere on the web, but no luck. I waded through the first 15 pages or so of hits googling zbk-110, and in every case (English, Western and Eastern European sites) the caliber list ends at 5.6x52R. I did find a lesser-known but similar model, the zbk-100 that was chambered in the larger rounds you mentioned. Do you think he could have been mistaken?