I think I recall Jim see is building one for a forum member in alaska. Maybe he can help you out?
I don't know about those SST's for hunting. "My opinion" is to stick with a bonded bullet, accubond or scirroco. I recently purchased a box of 130 scirroco's and was very impressed with the uniform bearing surface measurements I obtained.
you're going to have to interpolate. By way of comparison, I glanced at the 140gr bullets on 260rem data vs 7mm-08rem in my nosler manual.
imr 4350: 260 - 39-43gr, 7mm-08 - 42-46gr
rl19: 260 - 41-45gr, 7mm-08 - 45-49gr.
this tells me the starting load for the 7mm-08 is already max for 260. Same scenario for 6.5x284 vs 284win if not worse. 7mm rem mag starting loads far exceed 6.5winmag max loads.
keep in mind the 6.5 bullet will have a longer bearing surface than the 7mm bullet for a given weight, so pressures will run higher for a given charge...