270 WIN, when the m38s were counterbored it was done as an actual "make work" Counterboring can improve accuracy OR it can destroy it, many m38s as a result are minute of hillside guns, thing is, most had absolutally nothing wrong with them before they were counterbored....... When a rifle is counterbored it must also be recrowned at the counterbore, these were not they were basically just drilled back an inch or two (yea I'v seen a bunch of em counterbored back 2 inches) its a shame but the thing about communists countries, everyone must have a job...... no welfare system so the armories were the largest employers...
As far as the year of manufacture, the 91/59s were not "made" in 1959, they are older 91/30s that were already in the arsenal, these were then cut down to carbine leangth.
If I can get my puter to working correctly at some point today I will be able to provide more detail, right now the damage done by it getting trojaned and wormed etc.. is that while I try to type my curser suddenly starts jumping around in the stuff already written...... it makes it very difficult to write as I have to keep re-editing, this took 8 minutes to type!!