Re: Anealing question
I might point out here that the reason we have both "high number" and "low number" Springfield M1903 receivers, is that in the earliest production of the Army's new rifle, they heat treated them according to what "looked" about right.
Use the Tempilaq sticks to measure this. Like "L.E. Sam" Wilson used to say, "you don't know what you 'think', you only know what you measure."