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Another thing before a chamber casting, Take a round, lightly coated with Prussian bluing or a colored grease. Chamber it. and then look for wear marks. Maybe easier said than done. I use Prussian bluing a lot for checking operations for tight clearances or restrictions.
The only thing I know that reduce the size of a chamber is debris. The only chambers gauges I have are no gos. I use a dummy round for a go gauge.
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