We covered the low number Springfield issue before. The U.S. Army continued to use over one million low number Springfields in service until M1 Garand production replaced them. The U.S. Marines never pulled low numbered Springfield rifles out of service until Garands were available. During WWII, many low number Springfields were put back into service. The link below covers the topic very well. Factory or military loads are still being used in many low number Springfield rifles every year. All the best...
Gil
http://m1903.com/03rcvrfail/