yes, the military ammo issue is maybe the biggest point that they choose the 8x50R. since hirtenberger have finish 8x50R sporting ammo produktion around 1990 its a reloading only round. and I doubt that any old military ammo is around in india. so they have a round like the old 12/14 greener police gun cartridge. nobody can get it, only from licensed dealers.
seems to be that it work without problems in the lee enfield action and magazin.

finaly find it:

Specifications
1. Calibre
.315"/8 mm
2. Magazine
Box type, capacity 5 cartridges
3. Barrel Length
About 25.20"/64 8mm
4. Lenght of Rifle
44"/1117 mm approx
5. Wt. of Rifle
Approximately 7lbs. 6Ozs/3.34 Kgs
6. Safety
On left rear end of receiver (Body)
7. Range
275 Mtrs
8. Ammunition
S.A. Ball 8 mm/.315" Sporting available with 244 grain soft nose bullet
9. Telescope
Optional