I think if you look at the address stamp on the barrel it will have something like this, which designates it as 303 Savage;

SAVAGE ARMS CO. UTICA. N.Y., U.S.A.
PAT. FEB.7. 93 JULY 25, 93. OCT. 3. 99 CAL .30


SAVAGE ARMS CO. UTICA. N.Y. U.S.A.
PATENTED FEB 7 1893, JULY 25 1893, CAL 303