Bars bored for powder bushings are designated 502 series for progressive tools and 302 series for single-stage tools. The number below either series indicates the amount of shot the bar will dispense. For example a 302-118 is a single-stage charge bar and will drop 1-1/8 oz. of shot. Powder holes only are bored to accept bushings. It is mandatory that your order for bars includes both the series number and the weight of the shot charge.