DocAV- is FN 48 .303 with a green primer regular ball?FN made .303 ammo (Mark VII) both Before WW II and after, (I have FN 40 and FN50 to 60s) for use in SMLEs, Vickers Lewis,and Bren, and of course, Aircraft MGs (of which there were many in pre-War Europe.).
The ammo is superb (the FN 40 gives 2" strings of 5 at 100 metres out of a P14(F)W. -- 70 years old, and the cases are Berdan Reloadable--.217").
The Clips are "Mark IV" (WW II style) Clips, made by FN Post war, for use by the Belgian, Dutch etc. Post-War Armies, and for export further afield. Powder (Poudre-Buskruit) was usually Bofors (Swedish) and Box Labels for Belgian and Dutch Use are Bi-lingual (French and Flemish).
Primer/Mouth seal colours were different from British...Magenta-Purple for Tracer (Tip also) and Yellow for Ball (pre War) Red Post War Ball ( Primer only); Special Tip colours Belgian/US style); Colours applied as per Buyer's wishes, or in Default, FN's practice.
This ammo is "CombatPacked "Rifle ammo ( Brit style 50 rpound Bando...Copy of Brit Made ammo supplied during and Post War to Belgium etc.) Another Post-War FN customer was Greece ( 6,5x54MS and .303).
When Liberated in Late 1944, FN did not waste time in getting back into ( Allied) Ammo Production, whilst the Gun Factory Staff went to Massive overhaul of US Rifles etc, and Manufacture of FN M30 Mausers, and FN Mod.D BAR.
It may depend on the country that ordered it. all 303 FN ball I have has a purple primer. I've seen 8 m/m Mauser with a dark blue bullet tip that was Armor Piercing and 7.65 Argentine with the same exact color that was Tracer. I have some 7 m/m Mauser made by FN that is tracer and it has a purple primer, bullet tip, and a purple band around the bullet at the case neck. It can be pretty confusing. I wonder if green primer might be British A-P? Sometimes I CAREFULLY pull a bullet to see what the base looks like.