Seems to me, he was running them close to or just over 2,750fps. If you are going to try them, just be aware, you need to seat them a bit deeper, as in .030" to .050" off the lands to start with & start at the bottom for loads. Just read something in the new Hodgdon's Annual Manual to also use primers that are lead based as these help against copper fouling, as well as the CFE ball powders, if available. This was concerning ALL of the monolithic bullets, not just Barnes, but Noslers, Winchesters, Hornady, etc.
The article in that manual noted that none gave more or less fouling than the others and they all seemed to develop the same breech pressures as well.