Until the 80's the Swiss still had a stock of Anti tank shells for their 105mm howitzers...
Lack of other AT guns during WW2 (Except 47mm AT guns and 20/24mm AT Rifles) and after it was the best AT defence (but nearly immobile) until G-13 tank destroyers (Hetzer) were used in bigger numbers (and later Centurions and Pz61).
As far I found out they used Two types:
1) Panzergranaten 10,5 cm Pz G BoZ Lsp 13,5 kg and
2) Panzer
kerngranate 10,5 cm Kan u Hb Pz Ke G Lsp 1 Ladg 8,7 kg
1) older aprox. during WW2
2) newer, not before 1942, possible sabot ammo (kern=core)
It's only a guess, but I'm pretty sure, they not even destroyed them all these days... LoL
source (in German):
http://www.militaerfahrzeuge.ch/unte...26_37_402.html ... and others