Soot on outside of case, 9mm

aer21

FNG
Joined
Apr 24, 2016
Messages
22
Anyone know what is causing this? Cfe pistol powder, 5.3gr, 115gr bullet not sure what kind, I found them laying around from 10+ year ago. Loaded on Dillon 650. Chronographed approx. 1000fps.
 

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Joined
Apr 24, 2023
Messages
14
As others have mentioned this is common with lighter loads as they don't force the brass to seal as well.

From my experience loading 9mm for USPSA a little more powder would likely lessen the soot and provide more consistent velocities.
 

Bluefish

WKR
Joined
Jan 5, 2023
Messages
696
Probably light loads. If pressure is not enough to expand the brass quickly it doesn’t seal to the chamber and gets more soot. Some chambers, ie mp5, are just dont seal and you get lots of soot with any load. Won’t hurt anything
 
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