Have you ever heard of a rifle primed cartridge firing and ruining a pistol? If this is the case, since commercially loaded rounds do not say "For rifle use only", etc, then must they all be loaded with pistol primers? From Sixguns by Keith, Elmer Keith states the following on page 251: "First off, use pistol primers in pistol cartridges. Rifle primers are much too powerful for pistol use--they will detonate the charge, and usually ruin the gun."