I have been swaging jacketed bullets using donor brass from cartridge cases for a while now. I recently did a gun show, and as a discussion starter (promoting my reloading classes), I brought along a sample box showing examples of many of the swaged bullets I make, including the intermediate steps. One older fellow stopped by, and was amazingly intrigued with the concept. Took as many samples as I would share, and promised to write an article for a magazine he was involved with. Weeks later, he sent me a package, with samples and a copy of the book he wrote on the subject of rocket propelled ammunition (Gyrojet), and the guns that shoot them. Even more amazing than my swaged bullets. Wikipedia reference to GyroJet ammo
That fellow was Mel Carpenter, and here's a link to his info. Amazing who you meet in the gun world. Here's an amazing video, showing the Gyrojet in action
In any event, the toughest to find of the cases for making jackets are the 5.7x28FN cases. I use those for making 30 caliber bullets (both 150 gr that I load in 300 blackouts, and 168 gr that I load in 308 Win). So, for educational purposes, if anyone would be so kind as to send me some of those 5.7's, I'd be delighted to send you an educational package, showing the step by step system for converting them into 30 cal bullets. I need as many as I can get. They are like hens teeth to find. Only a couple of guns shoot them.
Wikipedia reference to 5.7x28FN ammo
BTW, those are 22 cal bullets loaded in the 5.7 ammo. Hard to tell size from the image.
Additionally, here's a CastBoolits thread discussing my making of these bullets.
http://castboolits.gunloads.com/show...-grains-HOW-TO