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Old July 23, 2017, 01:36 PM   #27
JohnKSa
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Join Date: February 12, 2001
Location: DFW Area
Posts: 23,038
Elmer Keith experimented with tube primers and the results were good, but apparently not favorable enough to prompt any ammo company to pick the idea up and run with it.

Using two powders in a cartridge (usually with a faster burning powder over a slower burning powder) is called a duplex load. I suppose a triplex load would be the same thing with three powders.
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