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Old 01-14-2016, 12:16 PM
32-40win 32-40win is offline
 
Join Date: Oct 2010
Location: Near Drumheller
Posts: 6,733
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Need to be a bit careful about the Ammosmith vid there, it is a valid illustration of a few problems, but is also a bit misleading in that he is incorrectly identifying some problems as being high pressure, that are not.
Expanded primer pocket illustrations are good, web expansion is not really explained well, needs to measured with a micrometer against a known constant for comparison. The "incipent" (incipient) separation ring can be a pressure issue, but is also an indicator that the brass was sized too short for the chamber, which can also show as flattened primers on the initial loading, long before the ring shows. Needing to trim the brass every 2nd or 3rd load is a sizing or pressure issue sign as well. If it is soft brass, or high pressure, needing to trim often, and primer pocket expansion, and the ring appearing in under 5 loads, show up together. There are articles further back in this sticky that explain these issues in more and better detail.
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