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I did a work up from 3.3 grains HP-38 up to 4.1 grains with a OAL of 1.125". CCI primers and WIN brass. Don't remember off the top of my head what Ruger I used for the trial but know they chambered cleanly in my Ruger hand gun(s).
3.8 grains was the lowest that would cycle all test rounds. I wouldn't be against shortening the OAL a little bit, but tend to use the longest my guns will feed reliably. Having said that, I have settled on 4.0 or 4.1.
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