Are sub-sonic bullets truely that?

To answer the topic question, yes. Depending on the features of the body, you can get locally-supersonic flow in the trans-sonic regime. For the subsonic round, it looks like the flow needs to accelerate to dip down into the cannelure and then decelerates back to subsonic, producing the shockwaves normal to the mean surface.

Cool video, thanks for the post.
 
Depending on the features of the body, you can get locally-supersonic flow in the trans-sonic regime. For the subsonic round, it looks like the flow needs to accelerate to dip down into the cannelure and then decelerates back to subsonic, producing the shockwaves normal to the mean surface.

Hmm, yeah. What he said... ;)
 
If i understood the heavy accent correctly. The shock wave is super sonic.
Like to see the guy do 22lr and shotgun slugs
 
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