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S&W Model 29?
The S&W cylinders on all revolvers are heat treated, the steel is also examined for porosity before the charge holes are drilled and chamfered. All of the manufacturing steps are inspected before final assembly. The chances of a defective cylinder are remote, so as TR said it is more than likely ammunition related. People that reload their own ammo sometimes push the envelope and use the wrong powder or too much of the correct powder or both; thus you can observe the results in the photos of the Model 29 with the blown cylinder. As for factory ammunition from a U S A company & made in the U S A it is also a remote chance of getting a hot load or a cracked case that would result in a catastrophic failure as seen in the photos of the Model 29. Quality control of production ammunition is set according to SAAMI standards and The National Reloading Manufactures Association....TK
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