with the proof load of 3,5 Gramm Gewehr Blättchen Pulver

its possible now to find rifles out that were rechambered for the 10,75x68 later.

original 10,75x68 rifles were proofed for 3,7 Gramm:

rifles for the 10,75x61 Hänel were proofed for 3,2 Gramm

http://forums.nitroexpress.com/showflat.php?Cat=0&Number=340523&page=0&fpart=1&vc=1

because the 10,75x57 have the same OAL like the 10,75x61 this rifles were probably proofed also for 3,2 Gramm

when all other 10,75 cartridges became obsolete after WW 2 one or the other rifle was rechambered for the 10,75x68 like buckstix Hänel Mod. 1909

http://forums.nitroexpress.com/showflat.php?Cat=0&Number=340523&page=0&fpart=2&vc=1

and the 10,75x63 was a special aspirant for this where the work was very easy