Think I would get new brass instead of doing the ball bearing trick. The only way I would do it is if the cartridge is really hard to come by. Something like a 6.5x54 MS. Which I have one.
The way I look at it. You start out with one method. Then you start to up grade. You stop up grading when you feel you don't need/want anymore, or spend anymore. I have an Annealeeze for now. It's doing the job. Sometime in the future, I would love an AMP. Will I get one. I need/want other...
I is a engineer. Got degrees in mechanical and welding. I hate engineers for the most part. The ones I have worked with are afraid of getting their hands dirty. If it's not in a book. It's wrong. I wanted to beat a few to death. There is a a few I dearly love. But that is a short list.