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Old April 14, 2018, 07:58 PM   #2
Mobuck
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Join Date: February 2, 2010
Posts: 6,846
"I noticed some flattening of the primers and was wondering if the back pressure as a result of the muffler could be causing some of the primer pressure signs?"
Not likely. The bore pressure at the point where the muffler is located is far lower than the chamber pressure at the moment of firing.
If you want to cut the "black and nasty" a little, use a faster powder. This builds pressure quicker and hopefully, lowers port pressure and DI system fouling.
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