338Rules
On that 6.5-280AI.... If you want one you will get one. But a really great rifle builder I know started with a 6.5-06 and then tried at least 4 different chamber configurations to optimize it. There were shoulder angles of 28, 30, and 40. There were different body tapers. When he got to the “final most bestest” version, for which he had custom dies built, he said it was a waste of time and suggested the 6.5-06. So there you go.
Lastly, my beagle doesn’t give a rip about cartridges because she is preoccupied with getting a treat.
Given Nosler 280 AI brass and a standard style (not the Type S bushing) Redding full length sizing die, the 6.5-280 AI is just as easy as the 6.5-06. I've been working with one lately. It's a very likable cartridge.