Question on SG serial number blocks

[CrossedCannons]

This is REALLY confusing me.

Looking specifically at Ruth's table (WB p442) of Saginaw's Monthly Production, only 293492 carbines were produced, yet the SN's assigned to SG fell into two blocks spanning over 638000 numbers. So there were a lot of empty slots. What precipitated SG's transition to stamping numbers from the second serial number block from the first block which was over 400000 numbers wide?

i'm trying to "date" a gun straddling this boundary

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