Yeah, I hit pressure WAAY before top. It was 47 grains or a hair over (quoting from memory/not checking notes) under a 140 TGK seated at 2.825 or somesuch OAL. Hodgdon published data say a 140 A-Frame over 51 grains of SB6.5 produced 2976 and 59.3 KPSI in a 24 inch barrel. To be fair, my bullet is longer, but I'm seating it nearly 0.075 longer and have a much shorter bearing surface, so if anything I'd expect to produce less pressure than their A-Frame, not more.
I was using WLRM primers, if memory serves (or WLR, which is still damn-near-a-magnum primer compared to most other primers), so that might have contributed to a pressure spike I guess.
I got similar results from Hunter in the way of early pressure/low velocity (admittedly Hunter is a bit slow for a 140 in a 708), but, I tried hunter with some 160 SBT's, and that did not seem to pressure out at all, and I'm confident I could run 2700 FPS with the 160's and Hunter without any excess pressure.