I usually use the softest load that will function 100%. These "old girls" are near/over the 100 year old range, and I try not to break any parts. I have had to replace a couple of extractors and a firing pin spring guide over the years. Are you using a fluted firing pin or the old solid pin?? If you are not using a later model fluted one, I will recommend one to you. You can purchase the aftermarket ones for cheap, and the originals for more money. They will channel the chamber pressure safely, in case you experience a pierced primer, and not destroy the breechblock.
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