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https://www.youtube.com/watch?v=XRuKKchj7sk
Properly set up, it might eliminate the need to turn off the swaged donut around the base when doing "extreme" case forming. That extra material could be nibbed to lengthen the case; say, if one wanted to make .22-15-60 or .25-25 cases out of something more readily available. The web around the primer pocket would be soft, for sure, but might not swell too badly at blackpowder pressures.
Thank you for sharing the video. That process would be very unlikely to work with brass. There is a similar machining process known as spinning, which does not generate as much heat. Neither of these applications would be a good choice for cartridge brass manufacture. Besides the excessive heat generated [another similar process is called spin welding], the process in the video produces a galled surface, and there's little control over internal dimensions. A much higher level of precision and repeatability is achieved using the die swaging process that we're all familiar with when using reloading dies. If a person owns a metal lathe and desires forming hard to get cartridge brass, a much better application would be to use the lathe to make custom dies.
I would think several things here.
1) its going to be very hard on the machine to provide the force to make that kind of heat. The force is going to be hard on the spindle bearings and compound carriage.
Notice the lengths of the tubing hes working with not only in the chuck but into the spindle also.
2) the unsupported end is not going to form easy or uniformly.Any variances will be pushed in with the spinning operation.
3) holding a case on a small area it going to walk and spring
4) keeping the case straight when forming in this manner is going to be harder than sizing.
Notice he shows the forming but not holding any dimensions when forming cases your holding length angles inside and outside dimensions.
Try it or a few cases but I dont see it working.
It's slightly similar to nibbing (a form of spinning), which has been mentioned here a couple of times. A small ball bearing is brazed to a piece of steel and is used to lengthen the brass and in the process thin it. The brass does have to be backed up with a steel die.
https://castboolits.gunloads.com/sho...n-case-forming
https://castboolits.gunloads.com/sho...-brass-nibbing