I don't reload 7.62x39 but if I were to make hunting ammo for my SKS or make match ammo, I would buy surplus, pull the bullets, weigh the powder, make ever case powder weight exactly the same, press in a Hornady SST, then do a ladder test with the lowest weight to the highest weight I measured to find which one shoots the best. Then after that, just make every load exactly the same.
I once made the rookie mistake when I started hand loading for my .270. I found two loads 34 and 34.5gr of IMR 4064 both shot .50" in the ladder test so I loaded 40 rounds not caring if it was exactly 34 or 34.5. Well... It wasn't .50 anymore after that but then after inspecting the ladder test targets, I realized the group for 34gr was over here, and the 34.5gr group was over there..... It was still okay though. 1.5moa was fun for fast loading and there was still the occasional .50" group and a few 1.00". I've had no one to teach me how to reload so I've been learning this crap though trial and error.
2moa hey? Wow. My 5.56 Vz 58 with a scope is 2moa with federal eagle. I haven't yet tried to work up reloads for it but I plan to get .223 dies soon and try and find a load that will reduce it even further down to say like 1.5moa - 1.75moa.