use plus p ammo if you like , I am just quoting S&W's answer to my question about using plus p in my model 10-7 made in 1979. I figure since they made the weapon that they ought to know.They said "we do not recommend using plus p in your weapon" This was in an email a few days ago. Now then you fellers do what you all want to with your gun but I for one waited toooo long to find my sweet two inch model 10-7 to take any unnecessary risks.
this response was from "Steve" at S&W on 7/25/13
I don't question that this has been stated by S&W Customer Service, however it is wrong and nonsensical.
Since ca. 1937 S&W advertised that the .38-44 High Velocity version of .38 Special was acceptable for use in
all of its .38 Special revolvers. There were no J-Frame .38 Spl. for years after this date. This cartridge developed pressures ca. 125% of what current +P loadings of the cartridge do. It is absolutely certain that your 10-7 is at least as strong as the revolvers manufactured before WWII.
Standard pressure .38 Spl. has a MAP of from 15,000 to 17,500 PSI depending on whether the measurement is determined by Copper Crusher or Piezo electric guage. .38 Spl. +P has a MAP of from 18,500 to 21,000 PSI depending on the reference and measurement method. The .38-44 loading is generally believed to have developed
at least 25,000 PSI crusher. There is no SAAMI standard for the .38-44 load! Some reputable sources of the day believe that .38-44 pressures approached the pressure level of the later developed .357 Magnum!
There was never, to my knowledge and research, been a warning to not use the .38-44 load in a K-Frame S&W or equivalent Colt, but latter day "experts" would have you believe that the same revolvers which can use this load will someway be damaged by ammunition developing 20% or greater LESS pressure.
Now do you understand why the "Dire Warnings" about the .38 Spl. +P
make absolutely no sense?