Since you are worried about corrosive stuff in your Webley, it is probably worth considering how old your ammunition is, and what it was made with.
From the unburned powder discussion, at least we know that the ammo is made with smokeless powder. But, we don't know what the primers are made with.
Do you know how old the ammo is?
Are the cases "balloon head" or "solid head" construction?
SL1
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