From a safety standpoint, all the gun cares about is pressure. So, the pistol load is, effectively, a reduced load when compared to the .30-30. After all, it's only 79% of a "normal" load...
About the only caution I'd offer regards the issue of bullet hardness vs. velocity. If you use cast bullets, they should be hard enough so they don't strip. This is not commonly a problem below, say, 1,400 fps. Gas checks are a solution...
FWIW, hope this helps.
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