30-06 but be forewarned that serial numbers below 800000 are dangerous to fire due to poor heat treatment.
See: http://m1903.com/03rcvrfail/
30-06
With the serial number provided,your springfield model 1898 krag,was made in the year 1899.
All U.S. army springfield rifles were chambered in 30-06 caliber.
your rifle was made in 1940
1934-1935 They were on limited production.
probably 30/06 unless the barrel was changed.............
Your model 1898 krag was made by springfield armory in 1899.
Are you sure it says ARMORY and not ARMS?
Your springfield armory model 1903 springfield rifle was made in 1932.
The Springfield Armory M1A with a serial number around 042000 was likely manufactured in the early 1980s. Springfield Armory began producing the M1A in 1974, and serial numbers in that range indicate it was made during that timeframe. For more precise dating, you may refer to specific production records or resources dedicated to Springfield Armory firearms.
Your Springfield armory made M-1 Garand with a serial number of 5,449,068 was produced in the year 1954.
Your springfield armory made M-1 Garand with serial number 5,843,454 was produced in the year 1955.