Let’s look at the label itself.
Firstly it looks like a stock label used on a regular basis (Typed/mimeographed headings)
Details such as Powder Lot Number, Chyarge of Powder, “Cal .30” etc, indicate that the Powder to be tested was a “4895” or similar Type
The Charge was 47,3 grains (obviously to get the “normal velocity and pressures”
From the extra handwriting, 35 rounds were loaded and tested. it seems the average pressure(CUP) results were 69,130 # ( I take this sign to mean CUPs or PsI, as measured by Copper pellet compression))
Thus the "pressure “rating of this batch(Lot) of Powder was rated as a “High” pressure” Powder for Normal Loading densities…solution…reject the Powder, or reduce the charge weight for the Particular cartridge… More than likely, the charge weight was reduced, as Powder Lots for Military factories run into several (if not more) TONS of Powder…
Normal Factory procedure for each batch of Powder was to match it by Velocity and pressure to the cartridge case and Bullet used…and adjust the charge weight accordingly.
That is the difference between Factory “Lot” Powders, and the Retail “Canister” Powders as described in reloading manuals.
An interesting bit of Cartridge manufacturing Ephemera…and gives a better insight into Military cartridge manufacture…this is distinct evidence of procedures used.
Regards, Doc AV