From: Zagreb, Croatia
They use custom-milled AP rounds with custom-milled shell casings. I think they load the primers themselves. Big emphasis on using the correct loads for their rounds, as opposed to those operations that fire compressed air or other squib loads to 'fire' their guns. I've got the spent AP penetrator (minus a few dents and dings) as a paperweight, after I dug it out of the earthen berm behind the van target.
Prior Preparation & Planning Prevents Pathetically Poor Performance!
A & B: WitW, WitE, WbtS, GGWaW, GGWaW2-AWD, HttR, CotA, BftB, CF
P: UV, WitP, WitP-AE