The use of the Term “NORMAL” (as in Normal Patron or Patrone) in Germanic and Skandinavian Languages, does not equal the English “Normal” ( ie, usual or common) but the English “Standard”, ie, to a set, regular Pattern. This was first a characteristic of the 8,15x46R SCHUETZEN Cartridge, introduced in the 1880s, for the Serviceman’s Training Rifle (“Wehrmanns Gewehr”) for use by Reservists at Range Practice in Rifle Clubs, to which they were expected to belong whilst on the “Reserve List” It is listed as the 8,15x46R NORMAL-Patrone in German Catalogues from before WW I, and on Packet Labels and in Literature. This clearly indicates a “Standard” Civilian cartridge for use by Rifle Clubs etc.
Thus whilst usually mistranslated as “Normal” ( ie, usual or common) its true meaning in Cartridge speak is “Standard” or “Pattern” cartridge. Word derives from “The Norm” ( Latin Norma) meaning, the set or fixed manner of doing things ( of course in different areas (such as Mathematics,) it has an expanded meaning, meaning “The most common”).
In the case in Point, “nptr” is actually “Standard Cartridge” in design etc., from which other variants are derived…it may be “common”, but it is “Standard.” or “Set ( or sealed) Pattern”
Normal (usual) translations don’t always convey the true Technical meaning…especially in Ordnance.