Curious - how did you proof it with a factory load? or do you mean test fired?
RST would be the best best for info, keep trying- they have always responded to any voice mail I have left.
but since both lengths in RST are meant for vintage guns, I would not expect a significant difference.
PS;
pictures?????
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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