Probably because they are the WRONG cartridge for your revolver. The most common mix up is between .38 S&W, and .38 Special. the .38 S&W is shorter and fatter, and does NOT interchange with the .38 Special. There are at least 6 different .38 pistol cartridges- such as .38 Short Colt, .38 Super, 38 New Police, etc
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