partsboy: Limited use of PlusP should be fine, but do most of your shooting with standard pressure ammo.
cew702001: 1969-1970 for your gun. I'm not a gunsmith so I can't answer your question. Try starting a new thread in the gunsmithing section.
vader_z: Your 686 was made between January & November 1984. Your 18-3 was made in 1974.
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