If you happen to be looking for a shellholder that fits cases of .410 bore shells, an RCBS #43 is a perfect fit. Bought a #43 today, and yes it fits very well.
You could not punch out primers, since the hole in the middle of the holder is too small. You could try boring it out, but that's very hard metal in that thing. There's better and easier ways to punch out shotshell primers anyway.
In case you want to cross reference with other shellholder makers, RCBS lists these metallic shells as the ones a #43 fits:
.223 Win Super Short Magnum
.243 Win Super Short Magnum
.25 Win Super Short Magnum
.270 Winchester Short Magnum
7mm Winchester Short Magnum
.300 Winchester Short Magnum
.325 Winchester Short Magnum
This reloading of .410s is coming along quite nicely - I enjoy it!
Rick