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Beretta 303 are 722 or 723 standard Mobil choke barrels. You may be correct 727 but I would check it with another gage. The Mobil choke will work but will be off by .005 pattern it to make sure you are getting what you want.
 

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Ron the 303 factory bore can run from 721 to 730. I have seen them anywhere in between and after checking different barrel gauges this has been verified. The vast majority usually run 722-725.
 
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