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I have heard I can use +P ammo in these revolvers if dated after 1957. Would you agree with that?
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Yes.
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S&W Model 41 sn# Tgy79XX or Tby79XX.
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1991 or 1988.
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could I get dates for a 17-2 K63xxx and a 18-4 270Kxxx
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You're missing a digit on the 17-2. Assuming it's K63XXXX, it's 1965.
270KXXX = 1983.
Jim