SB Knock Out 5.5 mm (.217 Cal.) 25.39 grain Slugs. At 25.39 grain /1,645 grams, the JSB Knock Out falls under the heavier air pressure ball.

Due to the use of JSB known soft lead and the hollow point, these slugs have a very good expansion when impacting the target. The ballistic coefficient of this JSB Knock Out 5.5 mm 25.39 grain slugs is 0.084.

The exact size of these slugs is .217 and there are two hundred JSB Knock Out 5.5 mm 25.39 grain slugs in a package.