Colonel Whelen said only accurate rifles are interesting, and I tend to agree. Unless an old rifle has a history that you enjoy, or maybe a mechanism that you find fascinating and is worthy of hanging on your wall, it probably isn't worth investing in. A M1903 Springfield would be a great choice for sporterizing as a gunsmithing project, or maybe the right 1898 Mauser, but the values of those have exceeded their usefulness for that in recent decades. In original trim, any military type bolt action is not going to be much good for reliably hitting anything smaller than a cantaloupe at 100 yards. Rifles of that vintage tend to be chambered for enormous cartridges that straddle the timeline between black powder and smokeless nitrocellulose, so they're not enjoyable to shoot for more than a few rounds either- they pack a whallop. Whalloping is fun, but only when you can hit your target. With the ban on milsurp ammo imports, cheap .30-06, 8x57 Mauser, and 7.62x54R is all but gone, not to mention Swede, Carcano, and the rest. So unless you find a rifle particularly attractive, it's probably better to plan, save, and search for one that suits you better.