Fraser's falling blocks came in two sizes (pretty sure anyway), one for regular cartridges up to .500 BPE or 500 based cartridges and another smaller sized action usually reserved for rook cartridges.
The size difference between the two is substantial.
That is why I expressed such concern in shooting a 360 nitro load in such a dainty action.
Now, to the rifle at hand, size wise, it is of rook rifle configuration but is chambered in a cartridge more suitable for small deer and larger small game.
Something more akin to what was referred to as a "Park Rifle" from the muzzle loading era meaning a rifle used for small deer in a deer park. My understanding of that is that the very wealthy and royalty reserved land on their estates for that particular use.