FYI. what's in 7.62x54r light ball

[jkor]

I picked up some unknown steel case 7.62x54r from a pawn shop, and opened up a can from 1972. to feel better about using these I pulled the bullet from one of each. One has a silver tip, the other does not, but both look exactly the same. both have a 148gr boat tail bullet, and 48.5 of extruded powder. The powder extrusions are much longer than the H4350, and RL15 I have on hand. tried burning a small amount, the powder burns quite slow and was difficult to light with my BBQ lighter. The Bullets were .311 in diameter.

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[Reloader762]

These two link will probably help you figure out what you have. Once you figure out what country of origin the ammunition is from using the head stamp if it's on the other link, you will get details on the cartridge.

https://thinlineweapons.com/7.62x54r/7.62x54r.net/MosinID/MosinAmmoID.html

7.62x54r Ammunition Evaluations

 

[po18guy]

Depending on the deterrent coating used some propellants are rather difficult to ignite with open flame. A primer is rather hot and forceful, as well as pressurizing the case. Smokeless burns very slowly in the open, but under the pressure of a primer charge, its combustion is essentially instantaneous and rapidly progrtessive.
Black powder burns at the same rate in a cartridge or in the open.

 

[jkor]

The random package seems to be Russian Novosibirsk ammo, the others I already knew was Bulgarian.