Vapor trail is just moisture in the air.
I push the 55's above 3600 with a 1:9 twist 223 AI. I fireformed a few through "super duece" - a 1:8 twist 222 mag ai.
Suppose, if boredom sets in, I could see how fast or when they explode from my 22/6mm AI with a 1:8 twist. That should push them past the 4200/4300 mark.
Do know, at 223 AI velocities....36xx, these bullet come apart rather nicely as they pass through a prairie dog.
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