Heres the ballistics-
http://www.rifleshootermag.com/ballistics/25_35_winchester.html
A quick search pulled up a couple different sources of ammo, not overly priced. It seems Win still makes ammo for it.
As far hunting goes, I would think would have enough pop out to 100 yards, but unless this gun is just a steal of a deal, I think I would pass.