M&P 340 J frame and 200 grain hard cast .357 magnum loads?

why a 200 grain? "Because they don't make a 210 grain." I don't mind recoil..I have a s&w 360 and have shot 158gr jsp and 158gr hp's...they feel pretty snappy but whatever...Everybody here on the forum should know that a 357mag is gonna kick when fired from a 12 ounce rocket..

Since this is my backup gun and its going to be the last round in the gun I want it to penetrate as deep as possible. If I am on the 5th round of a back up gun then hollow points have no solved it. This will also allow me to know the gun is empty. Will the 180 or 200 grain double tap hard cast penetrate deeper out of the J frame?
 
the way to find out for sure is to pick up a box or two and shoot 'em yourself....YOU are the one who needs to be comforted by the firearm YOU carry, not anyone else here....
I doubt anyone here knows what the factory says about those loads, call Smith and Wesson and ask 'em....and post what you find out here, both about the loads and what Smith says
 
I contacted double tap and they said it will be safe. I am going to load 158 grain speer gold dots as my first 4 and a 200 grain hard cast as my last. Figure it will do alot of penetration if the first 4 hollow points failed. Worst case situation will is possibly drop a black bear?
 
One post recommended Buffalo Bore .38 +P. Good stuff but test it first. In my 638 the empty shell casings need to be pulled out by hand one at a time. The casings seem to expand and will not dump from the cylinder with a sharp strike of the ejection rod.
 
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