ORIGINAL: Ideaman

I agree that the right thing was done by asking what to do, and applaud asking.

I think you should definitely take to a gunsmith, especialy if black powder was used.

Water will work, but I think a light or penetrating oil would be the better answer to killing the powder trapped between the two bullets, if the bullets sealed well and were lubed it would be hard for the water to penetrate.

Again, Gunsmith is the answer.