No such ammuntion as 9mm rugger
Rugger is not a German word. If you mean the slang word for rugby, then it would simply be Rugby
'Rugger' is merely a nick name for rugby, and most likely emerged from the school boy game in Britain or Ireland.
In general those that follow union or league know the difference.
No they all meet the requirements of both codes.
Association football gained the nickname "soccer" in 1871 when the Rugby Football Union was founded. Both sports were called "football", so people called Association football "soccer" and Rugby football "rugger". Although "rugger" is rarely used anymore, the name "soccer" persists in several countries.
The game Rugby (at the time Rugger) was born in 1823 when William Webb Ellis "with fine disregard for the rules of football (remember football was yet to split into the various codes) as played in his time at Rugby school,Warwickshire, England
Gilbert just mainly specializes in rugby so not really anything
If they are both union code ... nothing. Youth rugby is played on the same basis as full international regulations