Re: problems with 7.62mm X 54R rounds in a Mosin Nagant.
Hi! I talked together some buddies about "your" trouble. From our talk: the Bulgarian and Russian ammo are commonly steel cased ammo and there are some cases that swell tight in the chamber. As long as the primers of the STICKY rounds look the same as those that do not stick after firing: then you are okay. We have had sticky bolts (thats what we call a hard to open bolt on a Mosin) with every kind of ammo except civilian ammunition made nowadays. The Communist ammunition was all over the place on tolerances and the ammo shows it at times. It would be near impossible to blow up a Mosin action: its very strong . We would just shoot the ammo and not worry about it IF primers look the same after firing it. If you are worried about this ammo, you can pull the bullets and reduce the powder charge by 10% and reload the bullet and shoot but I/we will bet you will still encounter sticky bolts every now and then. The worst sticky bolts I/we get are from Czech green lacquer coated steel cased light ball 7.62x54R ammo. Same ammo Czech copper washed steel case rarely does it but the green lacquer stuff is horrible....especially as the barrel heats up after a few round and REALLY TERRIBLE in the summer hot weather months.
Take a brush and solvent and be sure your M44 chamber is really clean of oil and grease as sometime this old grease can become like a hard layer in the chamber and make the rounds stick after firing. . Clean the chamber real well with brush and solvent and see what happens.
PS: forgive my "slang"....... Thanks.