I'm not sure that the speed of sound is an overly useful measure. As I understand it, and I've probably totally misunderstood, even in a "conventional" firearm, the combustion is subsonic even though the actual projectile velocity can be at least supersonic; and that it's pressure and the time the p...

I think this is what you're looking for.



Click the image, or this one

Very nice. I'm half tempted to get one myself

You're probably right overall, but "getting on social media" is about as attractive to me as shoving my finger in a desktop pencil sharpener that's being cranked by an amphetamine-fuelled gibbon.

YMMV

Noice. I particularly like the refit of the original valve body.