To Sharps 45-90,
You do have a long list of obscure cartridges and I had to read them all to find 45-90.
That turned out to be the only cartridge we have in common as I shoot 45-90 in my Miroku 1886 and in my Beretta DR, which turned out well.

I do not know where you shoot or hunt your .45-90 but my 1886 45-90 has taken some African DG including ele, buff, leopard and also plains game. It is VERY effective with 450 grain NF bullets at 2150 fps.

The only African game the my double has taken was a Blackbuck, in late spring before it got really hot here in Texas. I plan to take some larger game this coming fall and winter.

I share you distrust of other folks load data, especially since most of them do not use the powder that I do.