I look forward to seeing your results. I started another thread seeking actual chrony results but it turned into win mag bashing.You are very brave combining win mag and hornady solids, hang tough and ignore the haters ! I have some rounds that are a 450 gr Peregrine at 2350 fps. Pretty sharp recoil, my brother reckons pretty much like his 416 rigby.
Interesting little rabbit trail, my son found a 458 win mag and a 375 h&h in my back yard this week. Both cases were badly corroded and he pulled the bullet from both. 458 win mag powder was loose and -well powdery ! Looked like it would be good to go. 375 was clumped in a solid mass. So it appears that all the haters are wrong- compressed loads can be more stable than uncompressed depending on powder type and that 458 win mag cartridge would have been more reliable than the 375 !