3 ms·

Just to clarify, I'm pretty sure they're saying that the bullet left the muzzle at 3,300 fps and had decelerated down to 600 fps at time of impact, not that it

by akerl_ 4y ago

Just to clarify, I'm pretty sure they're saying that the bullet left the muzzle at 3,300 fps and had decelerated down to 600 fps at time of impact, not that it was moving vertically at 600 feet per second. So the fact that it was moving faster than a BB gun isn't really shocking.

mod 4y ago
After four miles, it's a little shocking to me. And I'm into shooting sports.
- Alupis 4y ago
  > ...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 https://en.wikipedia.org/wiki/.416_Barrett
  - NaturalPhallacy 4y ago
    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.
    - bjt2n3904 4y ago
      5.56 is 45 - 75 gn, typically 55 or 62.
    - OJFord 4y ago
      > .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.
      - mburee 4y ago
        0.556 cm ;)
        OJFord 4y ago
        ... touché!
      - NaturalPhallacy 4y ago
        Yeah. lol, I was thinking about how it's said "five five six" and paid no attention to what I wrote.
  - mod 4y ago
    > BC (Ballistic Coefficient) ≈ 1.103 Wow.
  - mrb 4y ago
    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.

by akerl_ 4y ago

mod 4y ago

After four miles, it's a little shocking to me. And I'm into shooting sports.

Alupis 4y ago
> ...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 https://en.wikipedia.org/wiki/.416_Barrett
- NaturalPhallacy 4y ago
  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.
  - bjt2n3904 4y ago
    5.56 is 45 - 75 gn, typically 55 or 62.
  - OJFord 4y ago
    > .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.
    - mburee 4y ago
      0.556 cm ;)
      - OJFord 4y ago
        ... touché!
    - NaturalPhallacy 4y ago
      Yeah. lol, I was thinking about how it's said "five five six" and paid no attention to what I wrote.
- mod 4y ago
  > BC (Ballistic Coefficient) ≈ 1.103 Wow.
- mrb 4y ago
  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.