Hi, I recently bought a brand new SW 642 revolver and have been practicing dry firing using snap caps. SW technical support said the service life of SW 642 is about 10,000 rounds before any major services on the revolver. I don't foresee shooting that many life ammo in the near future. Maybe 1,500 rounds a year for practicing. So I guess no service is needed in the next 6-7 years. How about dry firing? Is it counted towards the 10,000 rounds Service Life S&W technician told me? In other words, will dry firing (with or without snap caps) shorten the Service Life of my 642? Thanks for your input.