Corbin (Dave) has the copper filings so you can swage a nearly solid core and "sinter" it with heat or put it in a jacket...
![Huh ???](https://www.gboreloaded.com/forums/Smileys/default/huh.gif)
I suspect this might rival the lath turned stuff, but in the big calibers... Is it worth the effort? You can/could make changes with a lath just a bit easier and quicker than with a die... ??
![Undecided :-\](https://www.gboreloaded.com/forums/Smileys/default/undecided.gif)