The only 6.5mm caliber that doesn't torch the throat that I'm aware of is the 260.
I have 6.5x284s and this caliber is exceptionally accurate. Plus you can get Lapua brass. If you have any issue with belted cases, then the 264 mag isn't for you, but still a great caliber.
My next 6.5mm caliber will be a 270 WSM necked down. Short, fat case, probably not as hard on the throat as other large capacity cases. Of course I'll try and research any negatives on it, such as feeding issues because I prefer repeaters, not single shots.
If any of you gunsmiths have any knowledge on the 6.5WSM, let me know.