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Not necessarily.

The AG-42 and 42b used the same gas system (no difference other than one being stainless and one not). The rear sight is actually calibrated for both calibers, there is a little...

The best load for a AG-42 will not be any of the military loadings. Those gas systems are overgassed with standard military issued ammo (to the point that they used to oil the cartridges in service).