the primer. but again, it can vary from case to case. >> under a microscope, firearms examiners discovered this was precisely what happened. the impressions on the shell casing were still clear. and those impressions caused by the breech face were identical to the breech face impressions on the shell casing found in melvin snyder's barn. >> there was no doubt in my mind whatsoever that these two discharged cartridge cases had originated from the same gun. >> why would he have shot his gun on mr. snyder's property? there was no reason for that except for the fact to kill him. >> based on the ballistic evidence, prosecutors charged ronald harshman with first-degree murder. melvin snyder disappeared on may 25th, exactly one year to the day from when melvin started the affair with teresa harshman. >> mr. harshman is the kind of man that no one was going to