Something else I tried was I took 10 shells and measured the grain weight of the powder charge and took the average and evenly reloaded the 10 cases with the same charge weight backed off 1 grain from the average
I've done roughly the same thing with Turkish 8x57 ammo to the same effect. Now I just shoot it the way it is because its so darn cheap that it really doesn't matter to me much.
Just picked up a nice 91/30 the other day along with 440 rds of ammo for it that I'm going to play with on Friday