I've been happy to see that performance on the two pronghorn. I can feel good about how they died. The exit on the antelope I shot was the same size as that in the photo I posted, though I forgot to get a picture of it. While I use the 210 HVLD with my 300WM, for the 260 Rem I chose to go with the 143 ELD-X only because of the slight peace of mind it offers from not having to worry about any tip issues I've read about at times on Bergers (never experienced that myself but was nagging at me). The ELD-X is 1/2 MOA for me, which wasn't quite as good as the Bergers I was loading.
That's all the game that rifle will be able to take this year, but in the future I look forward to seeing how the bullet performs at different impact velocities. My son is my ever-willing pronghorn hunting partner, and I'm prioritizing teaching stalking and concealment so the shots are close. I suspect we'll have the need to air one out at a bit farther distance in the future. In meantime, if anyone has pics of performance as slower impact velocities, please share!