I just acquired one of these. It is a .32-20.
I haven't found much info on it yet.
Were they originally chambered in .32-20 or converted?
Should I stay on the light side of reloading data with cast bullets or just stay within the published data?

Second attempt!

Check the bolt face, as I've heard people say they shoot .32-20 WCF, and are chambered for that caliber. But also heard people say the bolt face is too large to extract a .32-20 WCF, and is closer to the rim diameter of a .38 Spl. 
You may want to do a chamber cast first, as I am uncertain of whether it's actually .32-20 or not. I found a video on youtube of a guy shooting his Model 25 Husqvarna with .32-20 ammo, and having good results.

But here's an old post from the CastBoolits forum, with some good info on your gun. Appears it is .32-20 originally:
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Have one of the same in close to new condition.  Barrel is stamped kal .32-7.65mm. It's not a tack driver, but it is fun to shoot. Far as handloading goes, I've used published data, still trying to come up with an accurate load.

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Mine does have the extractor.

I did some testshooting with a Husqvarna Model35 in caliber 30-30 WCF

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Some loaded cartridges....
Federal 210
20gn XMP5744
RCBS 30-150GC
Alox 2500Plus Lube

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Amazing 5-shot group from the 50m bench, open sights.

I have a model 25 in 32-20 double set triggers and more like a butter knife bolt handle also oct. barrel. I cant think of a better rifle to take for a walk in the woods. light quite powerful enough for most small medium game. but then I really like the little cartridges I have a low wall in 32-20 recently sold a Stevens 32-20 can currently have a smith m&p for 32-20. I also have several 25-20 218bee rifles and flat love to shoot them.