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I did consider 300 BLK too but to get started I wanted to get into some low cost factory ammo, hence 7.62x39 before getting into reloading.
I did wonder how much I'd actually shoot it (compared...

All good points thanks. To clarify I meant pulling the projectile, changing the powder load, and then putting the original SP projectile back in. (No decapping or priming.)

But I see there...

I'm just curious - still haven't decided to get into reloading yet - but let's say I wanted to make a batch of subsonic load out of factory steel cased ammo with 125grn projectiles, for used in a 16"...