I can't remember if I posted, but I bought the Lyman reloading manual (#49) on the weekend - that's my second reloading manual in 27 years! I bought it because it has cast loads in it.

It mentions a load using Unique and a 385gn lead projectile in the 458, it doesn't include this powder with the 500gn lead (these are the only two lead projectile weights that it lists for the 458). I'm presuming that this powder will work with the 405gn and I'm sure that I've seen somewhere here someone list a load for it (a quick "google" didn't help much).

AP/AS70 is supposed to have an equivalent burn rate to Unique and I happen to have a quantity of AP70 that I use for my 9mm pistol loads, so it's worth a go. This will help me cycle through the AP70 since I only shoot 50rnds a month in the 9mm and the powder tin otherwise lasts a few years. Wouldn't want it going bad prematurely (just joking - I store it correctly and it'll probably stay "fresh" for decades).

Any recommendations with this powder and projectile?

edit: unfortunately we don't get access to AA5744 powder down here.