The only cracked case ammo I ever had was Bulg surplus, was some nasty stuff that left the barrel and chamber all black and sooty like I was shooting a black powder rifle. This was out of a M39 and M44 both. I switched to CZ mil-surp ammo and all was fine in the same rifles.
I run into this a lot with eastern block mil-surp ammo.
Just clean the bore with hot soapy water and then clean as normal.
I have never had cracked Norma or Lapua cases in the same rifles, even the Winchester ammo comes out just fine and reloadable.