Poor Private said:I have found that musket cap tins are not air or water proof. If you look at the tin tins or plastic tins you will find they all have small air holes. But consequently pistol caps are closed up quite tight, and slightly water proof.
Must be due to the amount of caps and fulminate in each container. Musket caps more expolsive.
Poor Private said:Open the RWS tin and look at the back side of the lid. The paper label covers the hole. It so small it hard to see but it's there.