I've heard that Yugo surplus ammo is loaded hotter than other surplus ammo. Read somewhere that since Yugoslavia was a much smaller country than others, they invested more effort and resources into making their firearms. Like if they were gonna make guns for their limited number of troops, then they were going to make them well. Same thing with their ammo. Yugo Mausers are usually better quality than late war German ones, except for the fact that the barrels weren't chrome lined, due to no chrome resources in Yugoslavia.