[alfa6]

From looking at the shells I guess that they won’t fit a regular .22 airgun.

Regards

alfa6 ;>}

[50cal Smokepole]

No, they’re proprietary. The gun comes with an adapter (chamber insert) that lets you shoot pellets. It does pretty well for a smooth bore.

[mylife]

I imagine the rifling would prevent them from being inserted into the bore.

Even if they fit, you wouldn’t want to use them in a rifled bore.
The Shot column would spin out fast and wide.