New member here, hello. I have a model 36-1 with a 3" barrel and round butt. I have never fired it before and it looks like it hasn"t been fired since it left the factory either. So I don't want to mess up. The papers in the box say to use standard loads and not to use high pressure loads. Later made model 36s I've seen forsale in GunsAmerica claim to be rated for +P loads, what's the difference between the years in which they were mfg. or is it the way they were made.