loading light bullets on full power rifle cartridges was a finnish speciality in the post war decades. I think your compatriots have use such bullets also on bigger game than fox or wild geese, why not on roe deer also.
my older kemira reloading list is the only one having 308 Winchester loads with the 4,8 gramm bullet for the 7,65 Browning pistol cartridge. the only RWS load I can compare with this was the 6 gramm bullet in the 6,5x57, a cartridge used on anything in the alps.

this here is such a 10 rounds collector ammo box we were talking about lately Igorrock. its for sale but with 50 euro not realy the bargain of week.