Has anybody tried 120s with H4350 in 280 Rem? If so, what velocities did you see?

While doing load workup for a 280 Rem recently with 120 gr Barnes TTSX and H4350, I hit 3225 fps @ 56.5 gr and 3260 fps @ 57.5 gr (24" barrel).

No pressure signs, but those velocities were a bit higher than I had expected at those charges (my 2nd Ed Lee manual and Hodgdon online both list 3254 fps @ 59.0 gr as a max), so I chickened out and decided to pull the cartridges I'd loaded @ 58.5 and 59.0 gr.

I thought it odd that, historically, with different powders, using 140 gr jacketed bullets, this barrel has always been a touch on the slow side.