News for hackers. Stuff that matters.

A comment on At 4.4 miles, Wyoming team sets new rifle shot world record. Parent comment

Re:At 4.4 miles, Wyoming team sets new rifle shot world record by Alupis on Friday September 23, 2022 @07:40PM (#32958365)
> ...of a 422-grain copper bullet...

> The shot was made with a custom-built rifle chambered for the .416 Barrett cartridge

That's a huge bullet that was specifically designed for low-supersonic drag and extreme long range. It has a huge amount of energy at the muzzle... (8,767.4 ft-lb or 11,887 J according to wikipedia[1]) so ~600fps down range, even at 4.4 miles, is not that surprising.

The only surprising feat here is they managed to actually hit a target... which is quite incredible.

[1] https://en.wikipedia.org/wiki/.416_Barrett

[ Parent | on HN ]
Re:At 4.4 miles, Wyoming team sets new rifle shot world record by NaturalPhallacy on Friday September 23, 2022 @08:43PM (#32958746)
For the non-gun people in here that is an absolute chonker of a bullet.

The .556 (very common AR round) is 112. 9mm common in handguns is around 115.

422 grain = 27.35 grams / 0.9646 ounces.

[ Parent | on HN ]
Re:At 4.4 miles, Wyoming team sets new rifle shot world record by OJFord on Saturday September 24, 2022 @07:14AM (#32961470)
> .556

Do you mean 5.56mm, the NATO standard small arms round iirc? i.e. as an imperial measurement it'd be about the same as a .22, not .556.

[ Parent | on HN ]
Re:At 4.4 miles, Wyoming team sets new rifle shot world record by NaturalPhallacy on Sunday September 25, 2022 @02:19PM (#32974276)
Yeah. lol, I was thinking about how it's said "five five six" and paid no attention to what I wrote.
[ Parent | on HN ]
Re:At 4.4 miles, Wyoming team sets new rifle shot world record by mburee on Saturday September 24, 2022 @12:37PM (#32964247)
0.556 cm ;)
[ Parent | on HN ]
Re:At 4.4 miles, Wyoming team sets new rifle shot world record by OJFord on Saturday September 24, 2022 @07:46PM (#32967632)
... touché!
[ Parent | on HN ]
Re:At 4.4 miles, Wyoming team sets new rifle shot world record by bjt2n3904 on Friday September 23, 2022 @09:34PM (#32958999)
5.56 is 45 - 75 gn, typically 55 or 62.
[ Parent | on HN ]
Re:At 4.4 miles, Wyoming team sets new rifle shot world record by mrb on Saturday September 24, 2022 @12:21AM (#32959710)
Doing the exact math, a 422-grain bullet shot at 3300 feet/sec is 13,833 joules of kinetic energy (.5 * mass * speed*2 = energy)

Right before hitting the target it slowed down to 600 feet/sec, meaning it lost 97% of its kinetic energy during the flight.

[ Parent | on HN ]
Re:At 4.4 miles, Wyoming team sets new rifle shot world record by mod on Friday September 23, 2022 @08:55PM (#32958802)
> BC (Ballistic Coefficient) ≈ 1.103

Wow.

[ Parent | on HN ]