I didn't take it as a flame.
Hodgdon's data on most all calibers is usually on the conservative side. For the .280 it's down right anemic due to Hodgdon's conservative loading combined with SAAMI MAP being low for the .280Rem. The comparison, like you hinted at, is faulty as well, because all published data for the 7x57, for liability reasons due to the plethora of old firearms out there, is likewise anemic. In comparing case capacity of the 7-08, the 7x57, and the .280...the 7x57 should, with proper powder selection, be able to run 139s/140s at around 2900-2950 at around 60K psi. I have a pretty good bit of data my father compiled loading numerous 139s/140s in my brothers M77, all running 2900 right up to 3000fps with no problems, but then like you say there's no way to know the pressures . Somebody that wants to run a Quickload on it may can give a more precise prediction if they're so inclined.
Mule Deer in his 7x57 article last year suggested a max velocity of 2900 for 140s, and 2700 for 160s. 2797 for a 160, by comparison, would be warm but not nuclear IMO.
