My Miroku/Winchester 1886 45-90 has the same twist as the 1886 45-70. I have actually shot more stateside game with .factory 45-70 ammo than with 45-90 ammo. My 1886 went to Africa with hand loaded and custom 45-90 ammo and took an elephant with 450 grain solids at 2150 fps. Shoots through Cape buff easily.
[Linked Image from jpgbox.com]

Yes, search on Internet for 45-90 Express and you will find some such loads.

Last edited by crshelton; 02/06/22.
CRS, NRA Benefactor Life Member, Whittington Center, TSRA, DWWC, DRSS
Android Reloading Ballistics App at http://www.xplat.net/