You are fortunate you did not have problems with that 5 gr. charge.
Such light loads can result in excessive, and very scary, pressures. You get into a 'primer up' and 'primer down' situation.
I know is sounds counterintutive but that is the world of working with stuff that goes bang.
Do use your (recent publication) loading manuals and do not go under the minimum reccomended starting loads.
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