B Phi 1948 Lion Bulgarian Ammo...7,62x54R using 8x56R type headstamp ( I think 1948 was the last year they did this, before changing to the Communist "10"-Star-year for all Bulgarian Ammo.) The brass cases continued into the 1950s,( with the Soviet .254 primer) and is good quality.
Early primers ( up to 1949) are .217 Berdan and Corrosive.
As the Brass quality is good, one can reload these cases ( www.DAGAMMO.com
for .217 Berdan primers) , especially if the "unsplit" cases are annealed before reloading. I regularly reload (Berdan) Wartime Bulgarian cases ( 8x56R)Both Steel and Brass) with very little cases loss, even after 4-5 reloads. If one is really concerned with either the corrosive primers and /or the "brittle" cases, one can dismantle the ammo, remove the Primer, anneal and replace with a noncorrosive primer, and relaod to a suitable "medium" load for comfort ( I do this regularly with all types of old and primer-unreliable ammo)
Cans were (for 8x56R) 250 rounds, Loose paper wraps or Clipped Paper Wraps; I don't know for the 7,62x54R cartridges...maybe 300 would fit ( unclipped)...the Loose stuff was for Loading LMG mags and MG belts ( as in 8x56R cans...2x1 Label inside can usually said" Za Karabina, Pushka, v Kartechnitza" ( for Carbine, Rifle and Machinegun); cans with Clipped ammo the label was usually "za Karabina v Pushka" ( for Carbine and Rifle).
Other details on Label of Factory date of packing, and Powder Load and Lot/type.
With the leaky primers, two things must be attended to: the Corrosive primer residue on the bolt (beyond the Bolt face erosion -"primer ring") and the Cases will also corrode ( "black oxidation") if left more than a few days...I wash them in Washing Soda ( Sodium Carbonate) and Hydraulically decap them straight away...No corrosion of the brass. ( Old pre-WW I wash for US Cases for Military reloads ( "Gallery")
Aslo, the 1946-49 Bulgarian Lion HS 7,62x54R cases are a "Rarity" in collecting circles, so don't shoot them all off. They are part of the History of Bulgarian transition from a Monarchy to a Communist Dictatorship ( Lion was still the Bulgarian National and Royal crest, the Star was the Communist crest.)