Quote History Quoted:
I'd call smith. I called once about an old 38 and was surprised when the guy told me, "yeah that's pretty old for plus P ammo but a little won't hurt" guy was cool
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ripped from net.
"The following is quoted directly from a Smith & Wesson owner's manual printed in 1993:
Revolvers in which .38 Special +P ammunition can be used:
J frames - Models 60-4 (full underlug barrel only), 60-7, 60-8, 640, 649-2
K frames - Models 10, 13, 14, 15, 19, 64, 65, 66, 67
L frames - Models 581, 586, 681, 686
N frames - Models 27, 28, 627
Here is S&W's warning about +P ammunition -
"Plus P" (+P) ammunition generates pressures significantly in excess of the pressures associated with standard .38 Special ammunition. Such Pressures may affect the wear characteristics or exceed the margin of safety built into many revolvers and could therefore be DANGEROUS.
"Plus P" (+P) ammunition should not be used in medium (K frame) revolvers manufactured prior to 1958. Such pre-1958 medium (K frame) revolvers can be identified by the absence of a Model Number stamped inside the yoke cut of the frame (i.e. the area of the frame exposed when the cylinder is in the open position).
The "Plus-P-Plus" (+P+) marking on ammunition merely designates that it exceed established industry standards, but the designation does not represent defined pessure limits and therefore such ammunition may vary significantly as to the pressures generated. "Plus-P-Plus" (+P+) ammunition is not recommended for use in Smith & Wesson firearms."