I saw this on gunbroker, it looks like a very early 1903 sporter, pre-WWI. I have no idea who did the work. I'd love to hear opinions.

early 1903 sporter

Since it has a 1905 barrel date, why is it not 30-03 instead of 30-06 as listed?
Mike

I found the following, I think it addresses your question.

Since the new .30-06 was shorter than the .30-03, it could fire in 1903 rifle but resulted in poor accuracy. The 1903 rifles were all recalled, fitted with the Model of 1905 sights and bayonets, and rechambered for the new .30-06 cartridge. This last procedure was done by unscrewing the barrels, milling off the end of each chamber, re-threading the barrels, rechambering them, and screwing them back on the same actions.[2] This ended the short life of the .30-03; out of nearly 75,000 made, few original 1903 rifles escaped the conversion to .30-06 (estimates range from 50 to 100 rifles);

It might very well be chambered in 30-03.
A standard 30-06 round will chamber in the above and the operator wouldn't know the difference,,just assume it's a 30-06.

Not a lot of 30-03 loose rounds rattling around in most peoples misc ammo boxes to allow checking to see if it would accept that one or not.

A chamber cast would tell you but I don't know if that was done,,not a lot of descriptive info with the listing.
Neat rifle though. Looks like a Mannlicher Schoenauer sporter trap butt plate.

It might very well be chambered in 30-03.
A standard 30-06 round will chamber in the above and the operator wouldn't know the difference,,just assume it's a 30-06.

Not a lot of 30-03 loose rounds rattling around in most peoples misc ammo boxes to allow checking to see if it would accept that one or not.

I think,,but have never tried to use 270Win cases resized to 30-06 to make 30-03 cases.
(Maybe the factory 35Whelen cases would work too for this?)

I have read that the extra length of the 270case when sized up to 30-06 will result in a longer neck equaling, or nearly so, that of the 30-03.
Since the headspace of the 3 cases is the same (the case head to shoulder mark measurment), the difference will be in the length of the case neck of the new 270 to 30-06 formation.
It should be too long to chamber in a standard 30-06.
But should chamber OK in a 30-03.
..Well that's the theory anyway. As I said I never tried it.
I've only ever had one 30-03 and that was a Win95 deluxe carbine in that caliber and it didn't stay around long enough for the experiments to find out.

A chamber cast would tell you but I don't know if that was done,,not a lot of descriptive info with the listing.
Neat rifle though. Looks like a Mannlicher Schoenauer sporter trap butt plate.

If you look carefully at picture number 7, you can see two filled in barrel splines. I can't think of another reason for this other than it started as a 30-03 and was then re-chambered for 30-06.

The breech section of the barrel has been shortened to the point that a Springfield rear sight would no longer fit on it, so the inference is that the barrel was shortened as part of the sporterizing process.

I saw that the buyer from the initial auction did not pay, so the seller relisted it and it has sold again. Did someone on here get it? It would be interesting to find out who the maker was.