I posted before about reloading these shells but mainly all I want to do is replace the birdshot with BBs. What will I need to do that? I assume just take precise measurements and I won't even have to remove the wad.
If you are talking about using BBs for a BB gun don't do it. They are steel and will score your barrel. I did it myself and made pecker marks and dings on the forcing cone on a mossberg 500.