I load .38 special, .44 special and .45 colt to the near max load in the lazer cast book and have good luck with them. The first couple of times I loaded them I was about to toss them as they were awful. I called the company and talked to a rep and he said because of the hardness they need to be driven pretty fast. After I tried the loads he said and checked with the manual I started to have good luck with them.

They do have a specific velocity range that they like. If you don't have the manual you can PM me and will tell you about the loads they show.

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Mike
USMCR 84-87, USAF 87-07