The .45 ACP is probably the easiest of the autopistol cartrdges to reload. But be aware that powder charges are small and easy to double-charge if you're not careful. Examine the powder level in every case after you charge them, or collectively in a loading tray.
I use WST powder for very light cast lead loads. I use Ramshot Silhouette for very fast defense loads because it has very little muzzle flash. But my favorite powder for loading any weight, jacketed or cast lead, is Ramshot ZIP. It's similar to W231 but outperforms it and burns cleaner There is very good data here:
www.ramshot.com 