"Continuously Cast" is actually pretty common, and I think (but don't know for sure) that nearly all copper these days is continuously cast for reasons of productivity, efficiency, etc.
Most of the generic magnet wire available has 200-400 ppm of oxygen to achieve the best combination of cost, conductivity, capacity for being cold worked. However, 99.95% and 99.99% oxygen free Copper magnet wire is generally available. The casual user, hobbyist, etc. may have a hard time finding some in retail quantities.
Most of the generic magnet wire available has 200-400 ppm of oxygen to achieve the best combination of cost, conductivity, capacity for being cold worked. However, 99.95% and 99.99% oxygen free Copper magnet wire is generally available. The casual user, hobbyist, etc. may have a hard time finding some in retail quantities.