Sizing for gasser

[LRRPF52]

Honestly, you should be able to re-chamber your spent brass without resizing.

Can you post a picture of new unfired brass, fired brass, and resized brass all laying next to each other?

Not in a gas gun.

You can force a spent piece of brass into the chamber with a dowel, but you will need a cleaning rod to get it out.

Even with my Howa Grendel, I could not turn the bolt closed on brass that had been full-length re-sized, until I moved the shoulder back enough.