.30 Carbine and revolver cartridges. IIRC, you'll basically fill up the case whatever you load with it. There's zero chance of a double charge.

BTW; Awhile back it was all that was on the shelf. I called Hogdon and asked if H4227 and IMR4227 were interchangeable as my books listed the opposite of what they had. The nice gent at customer service told me; not exactly, but if you start with the starting load and work up, you should be ok.

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But then, what do I know?