For those of you with Lebels and Berthiers, AIM Surplus has Prvi Partizan 8x50R ammo in stock. I've had good luck with Prvi ammo in both 6.5 Carcano and 7.5x55 Swiss, so I'd expect their Lebel ammo to be good stuff as well.
http://www.aimsurplus.com/acatalog/8x50R_Lebel.html
http://www.aimsurplus.com/acatalog/8x50R_Lebel.html