Hello all. I have some unanswered questions about some of the relativly early Soviet M74 cartridges.
I recently aquired a sealed case of soviet surplus 5.45x39. The crate and cans are marked 270-75-lot number format. The factory on the wood crate and the steel tins in it are marked 270 lugansk and the 1975 date then lot number. Upon opening the crates i found cartridges headstamped 3 74 which are apparently Ulyanovosk cases made the previous year. Are these 5N7 or 7N6 projectiles, and why is the tin loaded with a diffrent headstamp than the crates and tins that it contains.
This has sparked two questions, the one about the diffrent factory and date than the markings on the tin (why, how?) and the fact that i was of the impression from wikipedia that these should be the “5N7” projectile weighing 50 grains. What is the diffrence in those two loadings? (5n7 and 7n6) and was the change over to 7n6m really 1987? was 7n6 produced along with the 7n6m with the hardened core? as in were they still making both loadings? this 5n7 loading seems to me to have been an early loading, wikipedia putting it as the first production m74 projectile, and if anything is going to be an early production m74, i would sure as heck think that 1974 and 1975 loadings would be it. I suspect that these are what is refered to as 7n6 because they appear nearly identical to late (1991) bulgarian 5.45 that i have cut open, with the same relative hardness of the core and everything. so i take it the bulgarians did not ever go to 7n6m or at least not in 1991 yet.
I am really mainly seeking more info on the 5n7 loading, and when 7n6 was started and when 7n6m was converted. In addition does anyone know if the other nations like poland and bulgaria ever changed from the widespread 7n6 with the mild steel core. Also my guess is that with these early lots that Uly produced the cases and sent the to lugansk where they were loaded to get their production up and going in the first few lots of real mass production, whch this early dated stuff probibly is.
-Thanks in advance for any info.