There are several well known bolt heat lot tables (one is referenced above). You sort of have to take them with a grain of salt as to exact dates as several experts have pointed out. In theory, any bolt used either before or at the time your rifle was made might be correct. The problem is that bolts could linger in bins. Very recently someone was selling bolts packaged at Springfield in January 1944 that contained a bunch of SA-12 S06<> bolts which according to tables were used in Aug 43. Clearly there were a bunch still around in january 1944 so the time periods in those famous tables must be viewed as roughly correct not exact.
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