At SCOTG in Laurens SC they have in excess of 1500yds.
I used to teach classes all the time at Legion OTG in Blakely GA on their 2500yd UKD Range. Hopefully they will have their issues sorted out and be back in business soon. Outstandingly versatile facility and they always treated me and my students like family.
I've owned numerous purpose-built long range rigs, my current favorite is a DRD Tactical .338 Lapua topped with a Nightforce BEAST 5-25x56mm.
I had a custom build on a Stiller action with a Bartlein barrel in .300WinMag. With handloads, easily range steel at Legion OTG out to 2,000yds. Sold her and want a replacement; trying to decide between a bolt gun and a Nemo Watchman 2.0.
Got to push the limits of the .50 over the weekend. first round hit on a 10" shoot-n-see at 1000, moved back to 1760 with a first round hit on the plate. moved back to 2250 and noticed the limits of my hand loads, got within 3" of the plate several times. next time out ill shoot some factory 750 A-max's and try to tighten up my hand loads.