TV's "Top Shot" for Slow-Motion video of bullets and bores.

[Land_Owner]

While watching reruns of Top Shot, it occurs to me that they have created some phenomenal video footage in slow motion of bullets leaving bores, gun motion in recoil, and gas clouds exiting barrels, at the least, from which we may conjure and opine.

I was intrigued by the first gas "puff" from the 45 ACP and revolvers upon the hammer hitting the primer and prior to the bullet reaching the muzzle.  No truer empirical evidence for expanding gas obturating the bullet base to the grooves and "flame cutting" (mostly in cast bullets) than a video camera within the barrel.

[CherokeeT]

I really like the show, they do have some very neat video and the challenges are interesting, usually.

[tacklebury]

Yep brass IS the seal on the breach end.  It has to swell to fill that cavity, so some blowback almost always happens.  Same with the bullet.  During that jump to the rifling there is definitly some escape.    I love the show too.