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Old July 25, 2013, 03:34 PM   #6
wogpotter
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Join Date: September 27, 2004
Posts: 3,228
Eliminating over pressure rounds & .38 carbon deposit rings as possible causes I'd suggest rough chamber walls from a graunched up reamer, or lack of finish polishing would be my next guess.

I don't know if you can do this to a club gun, so ask them first.

Take a piece of "Scotchbrite" (not sure if the brand exists there, but its a synthetic green kitchen scouring pad), cut it into a 1/2" wide strip across the pad & cut that in half to get 2 identical oblong pieces.

Take a slightly small cleaning kit slotted jag & bully a corner into the slot. Pull it in tight so it gets frmly wedged. Chuck a length of cleaning rod section into a power drill & screw the jag to that. Wet the pad with your preferred bore cleaner & SLOWLY run the spiralled abrasive back & forth a few times with the drill on LOW speed.

Repeat with the other dry piece.

Take a bore mop that will be a tight fit in the chamber & dampen it with a little brass cleaner. Remove the jag tip & put the mop on. SLOWLY run it in & out about 6~10 times on LOW speed.

Clean the chambers thoroughly.

What you've done is polish & hone smooth any minor marks that "grab" your fired brass. As long as you don't go hog wild you won't change any dimensions, just buff & shine irregularities.
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