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S&W Revolvers: 1980 to the Present All NON-PINNED Barrels, the L-Frames, and the New Era Revolvers


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Old 07-15-2010, 07:52 PM
Mech Mech is offline
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Cracking of the forcing cone in the .357 Cracking of the forcing cone in the .357 Cracking of the forcing cone in the .357 Cracking of the forcing cone in the .357 Cracking of the forcing cone in the .357  
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Default Cracking of the forcing cone in the .357

Hi
Iam new to the S & W forum and have just bought my first two a new 617-5 and a little used 66-2.I then found this forum and am trying to absorb some the wealth of info in it.
I have been wondering if it has been determind what actually causes the forcing cone to crack besides the bullet wieght.Could it be bullet seating depth or something else?
Thanks
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Old 07-15-2010, 08:17 PM
Camster Camster is offline
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Cracking of the forcing cone in the .357 Cracking of the forcing cone in the .357 Cracking of the forcing cone in the .357 Cracking of the forcing cone in the .357 Cracking of the forcing cone in the .357  
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Light bullets+high pressure+inherent weak design at 6 o'clock of the forcing cone.
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Old 07-15-2010, 08:23 PM
dfariswheel dfariswheel is offline
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Forcing cone cracking is actually metal fatigue caused by firing very high velocity, light weight bullets.

The most effective self defense round used to be the 125 grain, jacketed hollow point round. These were high velocity rounds with very hot gas from the fast burning powder. The combination of the impact of the bullet and the erosion of the hot gas causes the metal to work harden and crack.

One factor that was noticed on most guns with cracks were that the forcing cone was usually heavily fouled due to bad maintenance by the user.
Most damaged guns appeared to be blued models, with fewer stainless steel guns.

Methods of preventing any possible damage are to shoot heavier bullets, like the new "short barrel" loads in the 135 grain range or the 158 grain, and to buy and use a Lewis Lead Remover kit from Brownell's.
The Lewis kit uses a brass screen over an aluminum cone shaped head to clean the fouling off the forcing cone.
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