I believe the thing to keep under consideration is that the starting brass is 24ga. with only a .oo2" clearance at the base. My thinking was the majority of the hangup is a long taper in the chamber, but while it can work, I still would think there will be a somewhat smaller hangup when the base is able to start chambering. I would not size the brass cases for a loose fit, but keep it snug so it's held against the breech, then fire form. Again, only thoughts about how the situation seems to be described, sorry if I'm reading it wrong.
