You said a 350 grain bullet and A 350 XTP w/33grs of H110 can get you 1354FPS or thereabouts.
Whit cool photo, I never have seen them side by side and it would be cool to have a 500 magnum with them in another photo.
That 350 grain load is a .500 JRH load. I don't think you can get that much powder under a 350 in the .500 Special without severe compression.
Even if you could only get 30 grains behind that 350, it should be leaving the muzzle in excess of 1,200 fps which would still be some bad medicine, IMHO.
