Often times grooveless bullets were intended to be paper patched/jacketed. Without some good dimensions would be hard to say if this one fits that category or not. IF its OD is the same as the bore diameter of some caliber there's a good chance that is what it's for.

For instance, a bullet designed for paper patching in a .30 caliber would have a bullet of around .300" rather than the normal .309"-.311" of a grooved cast bullet to be used lubed & bare.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra