by ob1 » 05 Feb 2021, 12:31 pm
Powders for 9mm used to be AP50 or AP70.
AP50 loads were about half a grain less than AP70.
AP50 was favoured by those using lighter projectiles around 125gn for a snappier recoil impulse but quicker recoil recovery, AP70 was favoured by those using heavier projectiles for a slower recoil impulse and recovery. Go for the 450 in the new powder.