attaching gun cartridge for 7mm

[thuntress]

My nephew gave me a few boxes of 30-06 bullet cartridges. I thought I might be able to make some 7mm pens. My problem is how to attach the cartridge to the pen barrel. Any suggestions?
Tom H.

 

[Harley2001]

Here's a good place to look library http://content.penturners.org/library/pens/bullet_casing.pdf