One loaded shell and one primed shell would be better.
Umm , I think that is what was intended.....
Sigh... yes, that is what was intended. Loaded shell in right chamber, and a primed empty in the left. Pull trigger on loaded chamber, and if the other hammer drops, the primer on the empty shell will detonate, and there will be an indentation from the firing pin. Reverse the process by placing the loaded shell in the left chamber and the primed empty in the right to test for doubling on the other lock.
It is a good idea to perform this test on a new (used) gun. It may be helpful to repeat the test on each barrel several times because a gun with worn sears or other problems may not double every time it is fired. OK?
