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By measuring the diameter of the hole in the cylinder. The .38 S&W cartridge is substantially larger than the .32 S&W cartridge. The simple way is to attempt to insert a .38 S&W cartridge in the cylinder. If it fits, it is a .38. If it does not, it is a .32. Both calibers were made in a 5 shot revolver. The .22 version is 7 seven. Please note the .38 is NOT a .38 Special, but a .38 S&W cartridge.

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Q: How do I know if a US Revolver is a 32 or a 38?
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