Yes, the 12x29RF Lund carbine cartridge is a shortened 12x44RF (it was called 12 mm in Norway, not 12,7 mm). It has a 17,1 gram lead bullet and a loading of 2,7 g black powder. The rimfired copper case is 29 mm long. The cartridges were produced by Hovedarsenalet in Oslo from 1868 to the mid-1880’s.
Besides the ball cartridge, blank and dummy cartridges are known to exist.
The 12 mm Lund carbine cartridges are probably the most difficult Norwegian cartridges to look for…
From left: Ball, two drill cartridges and blank. Usually the drill is described to have a red wooden bullet, so the left one has probably lost it’s colour.