Hey, Old Cop...I carry mine every day in a pocket holster. This probably sounds nit picky, but I have a parts brush that I use everyday. I mostly wear jeans, and cotton jeans generate a lot of lint. I suppose that this really does no harm, but every day I take just a minute to dust off the lint, and run a dry patch through the bore and chambers to keep it lint free.
As far as cleaning after range time, we covered that pretty thoroughly in the other thread. I have quite a few of the centennial style guns, (all "No Lock"), and one of their strengths is that the action is closed to routine dirt and lint. On a gun that I carry every day, I would take it down about once a year and scrub the internals with whatever you are using for routine cleaning and lightly relubricate the internals. Most lubes will coagulate or thicken with the passage of time, and tend to "gunk up the works".
Also, I occasionally dust out the holster itself, to help minimize the dust problem. Good choice of ammo, but if you can find it, the .357 magnum version has just a little more velocity with the same bullet weight and structure, and does not recoils appreciably harder. Unfortunately, I have not been able to find it for some time, although the last time it was available I stocked up, and still have a good bit. I also stocked up on the .38 +P version that you named, as this is a little easier to obtain, but still not plentiful.
I would post some pictures, but have not recovered from the PhotoBucket debacle yet.
Edit: Hey!! I remembered how to attach a photo using the forum tools!!
From the top down, my 340 PD, M&P 340, 640-1 Pro Series, and 640-1 (all "No Lock" versions):
Best Regards, Les