OAL is subject to the bullets I find and modify. Yes, I said I am going to modify bullets. In bullet swaging terms, I am planning to "draw down" a .366" bullet to the .358"... that will result in a slightly longer bullet with a longer boat tail - assuming I can get it right. This type of work is (apparently) most often done with pistol calibers, but it is not unknown to do this to rifle calibers.
I am exploring the possibility of swaging bullets from lead wire and copper hulls, but I don't know if the tooling my dad obtained can do it. He actually has a fully-furnished bullet swaging station, and has no use for it. Very handy!
If it can handle it, that will save me about $500 in bullet swage tooling. I will need to build my own die set for the long bullets. Getting the oglive down just right will be interesting. I'll probably have to build a reamer just for that because I'm not sure you could "freehand" bore an accurate oglive on the lathe.
The goal is to fit into an un-modified AK magazine well, irregardless of whatever shape the magazine takes. Therefore the MAX OAL will be VERY close to the OAL of a standard 7.62x39 FMJ cartridge.