Clays, or AS30 as it's known in Australia is a handy powder for .45 ACP loads, as it is close to "Bullsye" in burn / peak pressure rate.
I'd not use it in .40 cal unless you wanted minor factor loads.
RePete,
yes, as I stated: Clays is very similar to Bullseye. Universal Cays is similar to Unique.
Unique is much slower burning than Bullsye.
Kirby.