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Re: the #40 primers; I seem to remember from Jack Lott or Elmer Keith's writings that the #40 was a corrosive primer so if they were to be used the barrels would REALLY need proper hot water & detergent cleaning. I'm not around my reference books right now, but I think the #172 was the non-corrosive follow on to the #40.
- Mike

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Yes the #40 primers were corrosive but were preferred by Elmer Keith for loading the big cases. The non-corrosive #172 primer was more powerful according to Elmer and he recommended dropping at least 5 grains of powder if changing to the newer #172 primer.

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