Follow up to my earlier question below. I used the 'Contact Us' link and what follows is the queries and replies.

Q: K-frame revolver general question: When/what serial number were the K-frames first rated for .38 Special +P ammunition? Thank you for your time.

A: A serial number range unfortunately won't answer your question. Whether or not a revolver can handle +P depends on it's revision number. The revision number used to indicate the ability to use +P is different for each Model revolver. If there is a specific revolver Model in question, we can provide you the dash number you will need to look for.

Q: My query was more of a general nature rather than against a specific model. I can appreciate how there isn't a 'line in the sand', so to speak.

However, from your explanation, can I safely assume that ALL models built prior to your model numbering system (so called '5-screw' revolvers) will NOT be rated for +P? And then further, that some of the early model numbered revolvers also were not for +P but that would have to be on a case-by-case basis.

A: Yes, that is correct, you can safely assume that. By 1997, most of our .38 Spl revolvers were rated for +P ammunition. An example is the Model 14 which is a K frame .38 S&W spl, also known as the K-38 Target Masterpiece. This model wasn't rated for +P ammunition until 1997 in the -7 revision. The -7 revision is when we introduced the new frame process on this model, which allowed the use of +P ammunition. On this model, this revision aslo indicated the change to MIM parts. If you have a revolver in question, and it doesn't have an integral frame lug or a MIM hammer, then you shouldn't use +P ammunition, unless the revolver in question is chambered in .357 mag.

Kudos to Ashley from S&W for her answers and patience.

Though it sounds like erring on the side of caution to a significant degree.

It smells like it has legal all over it but why wouldn't it?

S&W serials are always an interesting discussion point. They do not correspond literally with the age of the pistol in question. Earlier numbers can be newer and vice versa. There can be quite a bit of variation on these things. The MIM part of the answer is their safety here...no pun intended.