I've tried everything from budget AKs running PS to 1.4mil RPK loaded with BT. These calibers are fundamentally flawed. The pen is okay enough on paper, but when applied to real life Tarkov, hitting tier 4 armors 10+ times with bp, and even bt is standard. I've put In over 250 hrs this wipe alone.
I've tried every single caliber, weapon, gadget, etc. And in my own opinion, this caliber is a hair above useless. Even being overshadowed by .45 acp rounds, and in some cases even 9×19-9×18. These are not the biggest, baddest rounds in the planet. But they still account for seemingly half of the weapons in this game. And each, and every single one of them are trash. From the AK74, to the RPK all of them are shooting marshmallows, and you still get 7.62 unmodded AK levels of recoil for absolutely no reason.
Rant over. Not like BSG reads/cares about these anyway.