I have one and have tinkered with it some. I think you will find quite a bit of variance on the published FPS, and load data.
I had mine over a Chrono in NM at about 4000 ft and 90 degrees. I was probably shooting 260ABs or the 270 Horn. I think I was topping out at 2950ish. I think factory specs may list a god deal more than that.
2850 is a good bit more comfortable.
And like you, I have often wondered why there is little to no interest in the round, but as stated, I think once people open a box of ammo, the round seems Too Much of a Good Thing.
I may look into breaking mine in the future, as I would like to keep my retinas attached to my eyeballs.
That specs on the 260 Accubond and a decent FPS sure look appealing though.
