Yep it makes for a good read considering all my plans! I wish the case forming section was more detailed. I'd like to see how a cartridge base is swaged from a tube. Several of the cartridge descriptions indicate they can be made from X diameter tubing.
Sorry, I didn't look that closely at the cartridge. I actually got that idea from reading the accurate reloading forums. There are actually a few 35x39 projects out there. The folks who have made a 35x39 wildcat did so by cutting 35 Remington dies short and running the reamer into the barrel "short". So their 35x39 is really a "35 Remington Short".
I have done many calculations to compare the base diameter of the Russian 9x39 vs. a 35 Remington Short and determined it is probably NOT suitable for an accurate clone. IT WILL BE CLOSE! Close enough that I may go that route anyway. According to my calculations, the base of a "35 Short" would be wider than the Russian case by about .007". That may or may not be significant. If it is, it may bulge a 7.62x39 case during fireforming. The taper would be more drastic (less of a true cylinder) but it would probably work OK, so long as the fireforming was done properly. I wish I had a cartridge modelling program! I'd like to see a .35 and 7.62x39 superimposed over each other.
The neck is also a bit different on the .35 vs. the 9x39, but not by much. Probably not a problem.
I have an opportunity to get more accurate measurements. I want to make those measurements before deciding to commit to either a "35 Short" or building the reamer from-scratch.