That’s an unusual base closure on the copper jacket. The usual way was to completely close the base, leaving only a small pucker. I’d be leery of the core shooting through the jacket, leaving the jacket lodged in the bore.
What Pivi is saying is to reverse the inertia operation. Use the inertia to seat the bullet rather than pull it. Think about it and it will come to you.
Joe, don’t overthink the value of this cartridge. After all, it is only a handload. If it was mine, I’d simply store it with the bullet seperate so that it (bullet) can be seen in all it’s glory. Or, better yet, section it (the cartridge, not the bullet). The interesting part of the bullet is inside the case neck.