Obie73 wrote:I wonder why no one is importing some of the well-known US powders such as Unique to Australia. It's ADI or nothing over here, as far as I can see, and there's little or no published data on how to load for some pretty popular rounds such as 357 magnum with the available powders. It's a strange situation. Powder is apparently becoming widely available in the US again.
Most ADI powders are sold in the US under Hodgdon's brand, lots of load data if you use the Hodgdon names - listed in the ADI FAQ. Hodgdon don't make powder, they're just a reseller of products they buy the rights to sell.
.357 is a pistol cartridge so most rifle powders aren't going to work well. Some will certainly spit the bullet out the muzzle but most won't make much velocity and will leave a lot of residue in the barrel. If you can augment it with a grain of pistol/shotgun powder on the primer you may get decent results, but pistol powders would be better if you can get them. No powder manufacturers bother listing data for powders in cartridges wildly unsuited to them.