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I posted the below on the Joe Xiden AKA Brandon thread in this same sub-forum:

Brandon says that a bullet fired from an AR-15 travels five times faster than a bullet from any other gun:
https://twitter.com/robdoar/status/1564 ... 0-n1625653

Really?
Let's take a look at that, shall we?
The .22-250 is right around 4000fps. I'm sure there are faster rounds, but this is a good one to work with.
5 X 4000 = 20,000 feet per second. Changing that to miles per hour gives 13,636 mph.
The speed of sound at sea level is 761mph. That means your AR-15 is spitting out bullets traveling at almost Mach 18!
Well heck, no wonder it will "Blow the lungs out"!
https://www.newsweek.com/joe-biden-says ... dy-1711551
(No wait. Sorry - that was a 9mm.)

OK, back to the calculation. Assume a FMJ bullet traveling at Mach 18 - how hot would that get?
I confess that I don't know.
I do know that the Apollo space capsules re-entered the Earth's atmosphere at around Mach 20 and they exceeded 1100 degrees C.
Copper melts at 1084 C.
So, you best not be shooting any lead tipped ammo out of your AR-15 or it will melt. The copper will be almost to the melting point and probably deforming under that speed and temperature.
That must account for the expansion when it hits the target!

Seriously - why does anyone listen to anything that comes out of this man's mouth?