Thinking about this more, I think a good option could be to get a fast twist .308, throated short, so you can fit 220gr + projectile in the mag and still be close to the lands.
Brass , dies , projectiles etc will be as easy as it comes . Projectile will be real deep in the case and take up lots of case capacity, but who cares it’s not needed because subsonic, and you will still be close to the lands and mag feed = win
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