Custom expander mandrels?

[Scott Harris]

Could you message me Neil Jones info? I've never heard of him. Where's he from?

A mandrel is not a great solution for donuts, you will get inconsistent results depending on the ductility of each brass piece. Your best bet is either push your throat out like Alex said for single-shot applications or to neck turn your brass. I recommend neck turning because it is standard tooling many reloaders have. Be sure to get a cutter that matches your cartridge shoulder angle and then turn into the shoulder. Done properly, the donuts will not re-appear. You don't need to turn the necks, just get the cutter to take a very light pass on the neck but cut into the shoulder. You'll see the donut getting cut away.

 

[CKshooter]

A mandrel is not a great solution for donuts, you will get inconsistent results depending on the ductility of each brass piece. Your best bet is either push your throat out like Alex said for single-shot applications or to neck turn your brass. I recommend neck turning because it is standard tooling many reloaders have. Be sure to get a cutter that matches your cartridge shoulder angle and then turn into the shoulder. Done properly, the donuts will not re-appear. You don't need to turn the necks, just get the cutter to take a very light pass on the neck but cut into the shoulder. You'll see the donut getting cut away.

Yeah, I'm going to try Alex's method. leave it alone and load in front of it to see if it becomes irrelavent. Hopefully I can blow it to the outside of the neck shoulder junction where I can just leave it. From the research I've done using a lee collet die to resize the necks and putting a half inch washer around the case so it sits on the shell holder will possibly give the donut a place to go, and using a body die wont push it back to the inside because it doesn't resize the neck shoulder junction. I appreciate your info on this subject.