I snagged about 10K pieces of 7.62x39 commercial reloadable brass...
Over the decade or so of my range officer experiences. That alone amortized a lot of the cost of reloading. The biggest problem I've noticed when reloading 7.62x39 on my Dillon 550 is making sure to separate the Remington brass from the Winchester/Federal/Lapua stuff, because Remington uses Small Rifle Primers.
Neither my 3 AKs nor my 2 SKS rifles get fed steel-cased surplus crap. They each got a sampling, and accuracy was horrible, to say the least.
I have no problems getting 2MOA out of my SLR-95, and 2.5MOA out of my SAR-1 using my handloads. There's no way on Gawd's Green Earth could I do that with steel-cased surplus. Since ammo prices have gone sky-high, I have no qualms reloading for the round. (Not that I had any problems doing so before the current ammo panic...)
Accurate Arms 1680 is the powder you're looking for in the 7.62x39. It's very clean-burning, and produces the best accuracy and velocities for that round. Of course, it's made in Czechoslovakia specifically for the 7.62x39 round, so maybe that has something to do with it.