very generally speaking - this caliber uses "magnum pistol" typical powders... h110/w296, 4227, lil gun, 1680, Shooters world Blackout, Shooters world Socom, etc... so any powder typically used for 9mm, 40, 45 type ammo isnt going to work very well for us. they're simply going to be too fast of a burn rate for the case capacity and design of the 450bm cartridge. just like standard rifle powders (varget, 4895, win 748, cfe223 etc etc etc etc) are going to be too slow.
so if you're looking for potential crossover powders from the non-typical brands used/offered here in the USA thats the type/class of powder you need to start looking at within a certain manufacturer.
here's a crossover chart i found online that lists rough equivilants on the burn chart across a number of manufacturers.
https://www.lhs-germany.de/fileadmin/me ... ._2018.pdfalso, here's a non pdf of the chart from graff's posted above
hth