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Old February 9, 2013, 08:42 PM   #5
FoghornLeghorn
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Join Date: September 2, 2011
Posts: 960
I've looked into this issue and opinions vary as to cause. I've heard damage could result from lightweight bullets used with slow burning powder. I've also heard it was due to the lesser amount of metal at the 6:00 position of the forcing cone and only after many thousands of rounds. One former LEO told me he had only seen it in K-frame revolvers used by recruits for training.

I was also told that the magnum 125s hit the forcing cone faster than heavier bullets and thus destroyed the forcing cones. Because of this Smith and Wesson said to only use 158 grain mags since they start slower.

I don't know why it happens, when it happens. So I shoot only mid ranged ammo in my K frames. I save the heavier stuff for the N frame 357s.

That said, 10 grains Unique sounds pretty stiff for a light weight framed 357. That's what the K frame is. Designed to be shot with 38 special velocities and carried with 357. Bill Jordan was the fellow that came up with the concept, IIRC.

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