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This is a soot/dirty case. Lower pressure....not enough to expand/seal the case to the cylinder's wall.
Based on your complaint......
I was expecting to see your cases with black soot all the way down to the rim. But.....you also was saying that you were having fireballs. Which usually indicates.....unburnt powder being burned outside of the barrel......overload condition.
So, perhaps you should try a different powder. If you don't like the amount of flash. Or cut back on the amount of powder.
Aloha, Mark
Based on your complaint......
I was expecting to see your cases with black soot all the way down to the rim. But.....you also was saying that you were having fireballs. Which usually indicates.....unburnt powder being burned outside of the barrel......overload condition.
So, perhaps you should try a different powder. If you don't like the amount of flash. Or cut back on the amount of powder.
Aloha, Mark