Another claim of a "world record," this one using a 6'x6' target. It least it wasn't some random snake eater shooting at a random-sized target and calling it a "world record" after he'd fired a random number of shots. This was in competition and it isn't the shooter doing the crowing.

The shot was 4,134 yards, which they're calling the longest ever shot in competition, plus the longest ever shot with a .33-cal rifle. None of the articles I'm finding tell who was running the competition but (I think) it was held at the Spearpoint Ranch in Barnard Ks.

The rifle was a full-up custom shooting .33XC, which actually is a .338 Lapua AI, except PO Ackley didn't design it (because he's dead) so Petersen Cartridge (no relation to John Pedersen) flared the case body and steepened the shoulder, à la PO Ackley's standard formula for the "Ackley Improved" wildcats. Bullet was a 300-gr Hornady A-Tip, which is a bit out of the ordinary because that's a conventional copper-jacketed lead bullet. ELR shooters tend to favor machined brass monolithic bullets. MV was ~3,165 fps. 78 mils of holdover with 7.2 mils of windage. Which is respectable shooting in anybody's book.

At 2.35 Miles, This Is The Longest Rifle Shot Ever Recorded In Competition
The story behind Ryan Cheney’s record 4,134-yard shot

At 2.35 Miles, This Is The Longest Rifle Shot Ever Recorded In Competition