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From the article: https://nomadrifleman.com/world-record-shot/

The cartridge was custom made by Unknown Munitions in Idaho (which we think is the best commercial ammunition maker in the world), with Barrett brass, H50BMG propellant and a CCI135 primer. The bullet left the rifle muzzle at 3,300 feet per second and traveled 4.4 miles, slowing to 689 feet per second when it hit the target, over 24.5 seconds after being fired. We traded with a number of vendors over the years, and we really have to thank them for always doing what they promised without excuses, bending over backwards and going above and beyond.

This adventure took over 20 months of dreaming and 1,500+ focused man-hours of studying, building and testing a never-before-built system of rifle, ammo, optics, and gear; bunkers and ballistics study and the subsequent custom builds; extensive terrain scouting at various ranches in four states; months of practical testing to get to the point that the bullet even landed on the hillside, much less the target. The final result was six of the last eight test runs having the majority of our shots landing within a 75-yard radius of the intended target. We decided to get all hands on deck to triangulate our observations. Glad we did.

The rifle, with customized parts and accessories from Canada, New Zealand, Arkansas, South Dakota and elsewhere, was assembled in Idaho by S&S Sporting in Driggs, Idaho.
Rifle is chambered in .416 Barrett
Chassis is a Cadex Dual Strike from Canada
Barrel is an LRI from Sturgis, SD – 40” with a 1:9 twist. These folks are amazing in every way.
The barrel was “structured” by tacomHQ in Arkansas.
Action is a McMillian TAC50.
Trigger is a Timney.
Muzzle brake is a Terminator T6 from New Zealand.
The 350 MOA mount was custom built by S&S Sporting in Idaho.
The custom high-rise cheek piece was built by S&S Sporting.
The scope is the recently-released Vortex Razor 6-35×56 FFP scope with EBR-7D MOA reticle. This scope is the latest and greatest from Vortex Optics. After testing many other top-tier brands, Scott decided that this Razor was our best option.
The scope was held in place with a double set of Leupold Mark IV rings.
Support optics included a Delta and a Charlie TARAC from tacomHQ.
The bipod was a LRA.
Scott designed and built the shooting platform.
Ballistic software used – Applied Ballistics.