Quote:
Originally Posted by Ziggy2525
Just another internet story.
I have a 640 pro and a couple other j-frames. My 640 was shooting low with 130 gr ammo (+p and standard). I called S&W customer service and asked which ammo they tested with. The CS guy said they test/calibrate all the J-Frames with Federal 158 gr .38 Special standard pressure ammo. Not sure if it's true, but that's what he said. With 158 gr, my 640 is right on the money.
YMMV.
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That very well may be true but it doesn't (necessarily) make it the best round for concealed carry or defensive purposes. It merely means that you may have to make adjustments for POA / POI with other rounds.
As you say, mileage and needs may vary.