|
I can't address the SN, but...
it sounds like you have a early series revolver (when first released).
Have a mid-80's are and it have a couple of "alpha" characters in the SN, not just numbers.
I would follow the use of "+P" ammo, as the S&W website recommends against usage.
Recommend trying the 125 -135 gr standard pressure rounds thru the revolver.
|