Just got a very nice 99 in 250-3000 # says it was made in 1912. with it I got 10 boxes of ammo, on the boxes is marked the date as of 2 @ 1944,2 @ 1945 3@ 1946, 2@ 1947, 1@ 1966, all 100 gr. plus 1 with 87GR. Do I shoot or keep? Thanks for your answers.