One is more painful than the other.
I tested 100 of my reloads in my AR15. I was going to test out a 100 more in my AR pistol the next day but it was way too hot... I think that was over a week ago and each day seem to be just as miserable. lol Maybe the end of this week.
Does anyone lighten the grains on reloads for an AR pistol? If so, by how much? I bet it is probably not even worth working up a different load for it.