No, they're itty-bitty rimfires. I'm not sure from my reading of the site, but I think they're just primer-operated, no powder.
H3ll, I doubt you could fit even one granule of Unique or Bullseye in those cases.
The darned thing is so finely crafted, it's unbelievable. For scaling in the pic below, remember that the bullets are 2mm in diameter. (The thumbnail didn't come out, but click on it anyhow.)
Like, wow, man!
Go browse their site. You, too, will emit a wow.
Banned from import because of having "no sporting purpose." I wonder if they could be put on the Curio and Relic list as a Curio.
ETA: Sorry, when I uploaded what I thought was just a single pic of the gun and cartridges from my local HTML file, I didn't realize I would be uploading all the pix. So there's some redundancy there with the pix which appear above.