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The cyl contains first the chamber which is the length of the 357 case ,then the throat which is the dia of the bullet 357 .
There is a very small ramp (if that`s what it`s called)between the the 2 different diameters.
When you insert a 38 case which is .135" shorter than a 357 case & fire it carbon, lead. copper builds up in this area.
The throat is scraped cleaned by the bullet on each shot ,hopefully lining the bullet up to hit the forcing cone dead center .
Firing 357 without brushing this buildup out subjects it to hi pressures & compacts it into a very hard "crude" ring .
Scraping removes it to the "ramp" or throat step & probably loosens the buildup on it enuff it`s brushed away more easily.
It`s also removed easier if cleaned well before firing 357 rounds , but most shooters like to "warm-up" on 38s then go to the magnum stuff .
Choreboy while excellent for cleaning crudy bores & throats ,it`s still faster/easier to scrape it out .
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GP100man 
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