>>63849142
Alright for shits and giggles here is a 15 caliber long .224, 240 grains, G7=1.1, stabilized with a 1-in-2 twist. A 1:2 twist imparted on a .224 has the same engraving angle as a 1:3 8.6 blackout, so at equal velocities they’ll have equal angular velocity.

I wonder if 20 calibers long will stabilize