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Old July 31, 2020, 08:28 AM   #2
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 21,022
The firing in your revolver suggests the primers were not fully seated initially and needed the first blow to finish that job and sensitize the primer by compressing the mix between the cup bottom and anvil a bit. This happened with pre-1992 CCI primers a lot because the cups were significantly harder to seat than some other brands, making short-seating easy to do by mistake. In '92 (IIRC) the CCI primer lines were revised to eliminate the cup lip metal smearing that caused this. But the primers could also just be old and needed that compression. Try seating them really hard.

Sparks from the ejection port usually indicate low-pressure firing that failed to expand the case enough to seal the chamber gases in the chamber, so some gas and powder particles (some burning) got out around the case. You should see soot on the sides of the cases and perhaps powder particles in the chamber when this happens.

Given that you had a failure to fire and a low-pressure sign would seem to indicate the primers were weak. However, it may just be the seating problem, as primers that go off marginally do not produce as strong an ignition flame and produce wider velocity variation than those which are ignited smartly.
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