What I called the H (half stock) "carbine" is likely the most common encountered has a 20" barrel, DSTs and a butterknife handle in either the 21 / 22 series.
The "rifle" has a ?23"? barrel in either 21H / 22H. I've only ever handled one 21H rifle many years ago, rather rough but in hind sight I should have bought it.
The F (full stock / mannlicher) series 21 / 22 most likely used the 20" versions. Not a lot of info. (cataloges etc.) on any of these out there.
As far as available calibres they came in 6.5, 7, 8x57 and 7x64 to the best of my knowledge.
Perhaps the more "knowing" will chime in. --- John
