M&P .40 conversion to .357SIG

[Georgia Yankee]

jdh- You mentioned rounds were 2 inches off. I noticed that when I put the .357 barrel in a .40 gun, the round were about two inches low. In its factory condition, rounds were on target. Is this consistant with your results? Do you think that a 'conversion' barrel would eliminate the difference? also considering an adjustable rear sight? Any thoughts?

I have been reloading for years, and I have noticed that a light bullet, high-velocity load will shoot lower at short ranges than a heavy bullet loaded to lower velocity, fired from the same gun. I would absolutely expect a 125 gr bullet at 1400 fps to hit lower than a 180 gr bullet at 1000 fps at 25 yards (100 yards in a different story), no matter what gun I fired it from. I expect this is because the fast, light bullet zips out of the barrel before the pistol recoils enough to change the point of impact as much. A heavy, slow bullet makes the pistol whip up just a little more before it gets out of the barrel, shifting the point of impact higher.

 

[Magload]

I've just seen guys post here that they send their SL barrels back because they won't work. They need gun smithing to fit.

You should do a search because a lot will come up.

My Storm Lake barrel dropped right in my 40 CORE. It now lives in my 9 Pro. Dropped right in there also. BTW CS at SL is great. KKK barrels is also good and check out Carver Customs.