Hornady No. 489 Powder Bushing

Hornady powder bushings are identified by numbers that correspond to the size of their inside diameter. (For instance, the inside diameter of the #456 bushing is .456 inch). Bushings for powder charges in half-grain increments can be calculated from this chart. Simply “split the difference” between the two even grain bushings, and select the bushing nearest the result.

Hornady Powder Bushing Selection To find the bushing for 18 1/5 grains of Red Dot powder, not that bushing #468 gives a charge of 18 grains and that bushing #480 gives 19 grains. Spilt the difference between 468 and 480, and the result is 474. Thus, the correct bushing for 18 ½ grains of Red Dot is bushing #474.