Comments on: Mythbusters Film Pistol Shot at 73,000 Frames Per Second

By: Jerry Shaw

Jerry Shaw — Sat, 22 Aug 2015 15:53:14 +0000

Just a note – Mythbusters has been probably the most gun-friendly program on tv over the years.
The producers and presenters have done a lot of good by de-mythologizing a lot of firearms issues. That’s remarkable and we should let them know we appreciate what they do.

By: counterclockwisester

counterclockwisester — Sat, 22 Aug 2015 14:36:56 +0000

Interesting that the bullet is long gone before the case apparently releases its grip on the chamber wall and starts to slide rearward.

Also, notice the small vertical gas jet at the breech early in the firing cycle.
I suppose that is a brief puff of gas around the case to the rear before the case wall adequately seals to the chamber wall.

By: Neil Gibson

Neil Gibson — Fri, 21 Aug 2015 09:06:21 +0000

The gas leakage around the projectile and just the compression of the gas (air in this case) as the projectile moves up the bore will cause an outflow before the projectile exits.

The effect, when used with bigger guns (artillery and tank guns) could cause havoc with certain types of instrumentation (break wires, break screens, pressure sensors, etc.) attached to the muzzle which were used to measure the firing interval (electrical firing pulse to shot exit). The sensor would either break/trigger early or be blown forwards, all resulting in a false readings. It was an effect you had to take into account if you wanted to measure things correctly.

By: Dinc

Dinc — Fri, 21 Aug 2015 00:24:40 +0000

What the heck load are they shooting to get 1200 fps out of a 45 ACP?

By: Jerry

Jerry — Thu, 20 Aug 2015 20:30:37 +0000

That really is gorgeous footage. I am surprised so much gas is expelled before the bullet exits. That trait, as well as the uniform gasses behind the bullet, seem to serve as a good educational video to show the importance of a good true crown I think.

Impressive footage.