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Tom
Tom, Gunsmith
Category: Firearms Repair
Satisfied Customers: 4270
Experience:  17 years as a gunsmith, certified Armorer
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I HAVE A S&W MOD 19-3 REVOLVER. MY SON WAS FIRING SOME

Customer Question

I HAVE A S&W MOD 19-3 REVOLVER. MY SON WAS FIRING SOME FACTORY
.357 MAG. AMMO AND FIRED ABOUT 30 ROUNDS WHEN THE WEAPON COULD NOT
BE COCKED. THE CYLINDER FROZE AND WOULD NOT ROTATE AND THE HAMMER
COULD NOT BE COCKED.
OUT OF THE FRAME, THE CYLINDER ROTATES FINE AND THE HAMMER, TRIGGER
WORK FINE. THE RACHET, HAND AND CYLINDER LOCK APPEAR TO BE IN GOOD CONDITION.
THE WEAPON HAS ONLY BEEN FIRED ABOUT 2000 ROUNDS WITH NO PROBLEMS.
THE WEAPON WAS NOT DIRTY AND HAS BEEN CHECKED FOR ANY DEFECTS. DO YOU HAVE ANY SUGFGESTIONS? THANKS VERY MUCH FOR YOUR TIME.
Submitted: 2 months ago.
Category: Firearms Repair
Expert:  Tom replied 2 months ago.

Hi,

I have seen the sameproblem quite a few times recently and it has been the ammunition every time. Brass quality has been pretty badfrom some manufacturers. The thickness of the base or rim of the case has varied by up to .040" .The thinner cases will work fine, when one of the larger ones gets near the top it will jam between the cylinder and flash guard,(rear of frame)

Check your ammunition with a caliper, any over .045" in thickness will usually cause a jam. You can also see a case that is much thicker when you have the cylinder loaded and still out of the frame, point the muzzle down and spin the cylinder while loking at the rims. Any that look thicker should be removed.

Tom