No, we do not offer a Powder Thru Expanding Die for the 300 AAC Blackout. Case mouth expanding is performed in the Full Length Sizing Die for rifle calibers. To charge the cases, we make a Short and Long Charging Die. Due to the length of the 300 AAC Blackout cases, you would use the Short Charging Die
. The Short Charging Die is meant for cases between .860" and 1.760" long.