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I haven’t heard if this issue, myself. My own 10.5" barrel has a 1:8.5 twist, and it stabilizes 208 grain subsonics quite well, as it also does lighter bullets. I haven't shot any 220s yet. Other .308 diameter barrel bores I have are either 1:10, 1:11, or 1:12. But those barrel twists are for stabilizing .308 Winchester/7.62 NATO bullets at MUCH higher velocities, in longer barrels. I had originally just assumed that the typical 1:8 or thereabouts twist was aimed at stabilizing the lighter 110-125 grain bullets; but now I wonder, since .300 Blackout/Whisper was originally conceived as a suppressed cartridge of intermediate power from short barrels, if a 1:8 or 1:9 twist wasn’t chosen for stabilizing bullets in short barrels. Since .300 Blk barrels were originally pretty short (8" to 9"), maybe the twist was chosen to try and get at least 1 full turn in the barrel before the bullet exits—thereby better stabilizing the bullet.

I wonder what others have heard or experienced.