I had a round (brass, primer, powder & bullet) with 3 firing pin strikes and no “bang”, so I took it to Kapp and he showed me how a bullet puller works. I’ve embedded a video I found on tube that explains how this works:

Here’s my round set into the bullet puller, then taken out of the bullet puller:

My round in the bullet puller. Note the multiple firing pin strikes.

The brass, bullet and powder that came out of the bullet puller. The gun powder looked like glitter.

And, the fun part, we lit up the gunpowder just because I wanted to see how it burns in a non-contained space: