'Texas10': I think you meant to say reduced powder weight by three Grains (not Grams).

In regard to safety, I don't rightly know. I do not know what propellant was used in the old Factory Loads, that you reduced.

From what I have read over the years, DETONATIONS occur with reduced loads of slow burning powders.

IMHO - A safer course for you, would have been to dump the original powder charge, instead of reducing it, and replace it with a starting load of a known propellant, like IMR-3031, IMR-4064, or IMR-4895.