Thanks guys for all that extra info. After reading 2152hq's info and cross checking:
Serials Model 14 – Remington Society of America
I did not know that there might be a month AND year code. Also checking the other link shared in the previous post told me that the date code will not be stamped with the proof mark so now I know where to look.
Since it stands to reason that the barrel & the Serial numbered receiver might have been made at different times, that would account for the serial# ranges not matching exactly with the barrel codes. Taking all this into account, the most recent of the two would be the better indicator of a shipping time frame.
I will re-read the stampings and try to hit the range on Sunday (with Remington factory 200 grain round nose cor-lokt ammo) and report my findings and results.