Our friend Chunkum, RIP, had me load some of those bullets, on the right in Skip's picture, with 13.0 gr of 2400. They normally weigh in the neighborhood of 270 gr and delivered 960 fps MV out of my 5" M625-4. He intended to shoot them out of a M1917, which we did, after I did the preliminary work.
I used 2004 vintage Alliant 2400 and an OAL of 1.361" for that set of data.
The same load with a 255 gr Laser Cast produced 1044 fps MV at 1.23" OAL. I think seating that deep accounted for the majority of the velocity increase and probably raised pressures accordingly.
The group buy on Castboolits, for a reasonable copy of that bullet, is supposed to be getting to me in the next week or so.