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Parker's chambers were generally cut 1/8" shorter than the length of the shell recommended for use in them. This 1/8" provided for a better gas seal when the paper shell opened into the cone rather than stopping exactly at the shoulder of the cone.
You might expect a pressure rise of approximately 100 p.s.i. due to this design.
Again, not significant.
The Following User Says Thank You to Dean Romig For Your Post:
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