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I got it apart and found the following proofs.
on the right side of the receiver is 953 .01 and the NPv nitro proof. On the barrel is 953 .01
C 6.5
1606G
So it looks like originally it was a 6.5x54 and has been re-bored to 8x56. I also found further underneath the barrel 7.8m/m
.57
935
16
I also found the German Crown over N nitro proof over the above numbers. The serial # 295 is on the barrel and receiver as well as other parts including the stock. The 953rd rifle proofed in 1901 makes this an old one.

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Your Austrian proof marks indicate that both receiver and barrel were originally an M1900, a very special rifle indeed.

The rebore is unfortunate. Not only is it an alteration from its original state, but if it were still 6.5X54 you'd have readily available ammunition of a legendary round. We can only guess what magazine is in it (an M1908, or a reconfigured 6.5X54?). Will it feed well?

As it is, your options seem to be:

a) Slug the chamber and Wildcat some loads to see how they do. Perhaps the prior owner was on to something.

b) Have it rebored again to a larger cartridge that is readily available, but would still be safe for the barrel (magazine rotor would have to closely match cartridge profile).

c) Have it rebarreled (keep the original). Various 'Greek Contract' military Mannlicher Schönauers were 6.5X54 and are more readily available, as are parts (including magazines, rotors).

d*) Have the barrel lined to the original specification, get an M1903 magazine for it.

Regardless of which (or other) option you choose, consider that an M1900 Mannlicher Schönauer is to bolt action rifles what a Duesenberg is to automobiles. Though it would be expensive, a full restoration may be the way to go.

Photos?


Where is your cartridge release button located? is it between the receiver and the stock thus?
If so it is among the earliest of M1900 Mannlicher Schönauers:


Or is it surrounded by steel as in this image?:

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