Raimey,
I would not likely go with any of the ones shown. Since I make many of my own rifles, bullets and cases, I would more than likely make my annealer, if I wanted one. The ones you cited seemed to be for commercial operations. There are other, simpler designs around, some that use common torches and battery-operated drills already commonly owned by people that build their own "stuff". BTW, .257" bullets are shown in some data for these cartridges because there are not commonly available .260-1" bullets. Jacketed bullets with smokeless powder are not generally considered to obturate but may expand a little bit if they are large enough that the lands engrave the jackets. Obturation was commonly depended upon with lead bullets and black powder, when the bullets were often smaller than the bore diameter. BTW this is why it is difficult to ID the nominal cartridges old black powder rifles were intended to use, based only on chamber and barrel dimensions.
Mike
