The big flake powders like 700X, American Select, etc do not meter as well as the small flake powders like Bullseye and the small "flattened ball" powders like W-231. The really small "flattened ball" powders like AA # 5, #7 etc meter great. True Blue and AA #2 are tiny ball powders that have been left round and meter like water.
.38 - I like Clays
.45 - I like AA #2, AA #5, WST, W231, Competition, N310, N320.
.357 - I like AA #9 for full power, and Clays for downloading. True Blue is good for midrange loads.