I just finished up sizing some once fired brass. From what I read you want to size it without pushing the shoulder back. So I set up the die to just stay off the shoulder. The brass chambered fine with good action lockup. I did the same for my Handi Rifle in 223. I'm going to do a side by side comparison to see how they do against each other. I've never fired a 223 before so I'm really looking forward to it. I kind of like the size of the case. I'll let you know how that goes after loading tiny, to me, bullets in them.
As a deer pants for flowing streams, so pants my soul for you, O God. Psalm 42:1