Never dry fir a gun and never load more than 5 rounds.
When the Colt SAA was the most popular large caliber handgun in the US, both of these were true. It was handed down for several generations of gun people. When I got into Law Enforcement in '77 there were still agencies who would not let you carry 6 rounds in a modern DA Revolver. These are still true for modern made SAA and most clones. The firing Pin is rather cone shaped and when dry fired the firing pin will force metal outward at the hole where the firing pin goes through the frame. It will cause function problems. The same firing pin will rest on the primer if the hammer is lowered onto a loaded chamber, a blow to the hammer will likely fire that round.