on the 28.11.09 a 445 Nitro Grasset rifle popped up on naturabuy and was sold within 87 minutes.
http://www.naturabuy.com/Carabine-Grasset-l-africaine-item-460583.html
we have tried to reach the buyers and sellers via pm for more information about the rifle , it was unfortunately unsuccessful.
A look at the purchases of the new owner shows someone here with great interest to large caliber weapons.
go after the seller's description of the weapon it was into the seventies in Grasset's shop in Paris. He mentioned that the rifle has a Gras barrel which I am not really surpriced. maybe was the barrel quality of the old M 74 black powder better than I believe or grasset had access to later-made replacement barrels from better steel. that seems not unusual because the grass was still in servise with colonial units.

Grasset's barrel, note the shape and the caliber designation 445 nitro

the gras rifle, same barrel

the 445 Nitro is a 11x59R Gras case, rim diameter redused to +/
- 16mm mm because the bolt of the rifle looks original

8x50R Lebel, 11x59R Gras, 11x59R Hotchkiss/Vickers and a Lebel Bolt head

the lebel bolt measure 16,22mm inside

8mm Lebel rim 15,93mm

11mm Gras rim 16,71mm

11mm Hotchkiss rim 16,53mm
the last remaining question about he 445 nitro is the ballistic but I think that anything under the 11,2x60 Schüler ballistic - 330 grains bullet at 630 m/sec - was insufficient.

and now something completly different

I am still follow the way the 10,75x52R Springer brass and bullets from Harald Wolf were gone. the whole lot was bought from a german cartridge collector. he made the dummy rounds still in trade and sold the rest to a german owner of a Springer double rifle

9,3x53R Sako, 10,75x52R Springer HWM, 10,75x57 handload and 10,75x68 DWM

this man was giving the components to Samereier/Germany. well known here for his lathe turned brass for reduced powder charges http://www.samereier.de/ladetabelle_1.htm
I think that 45 grains N 135 were shooting together in this and also other Springer double rifle's.