Did a quick scan in Brownells. Metalform has them in 9rd. SS and carbon. Most of the .38 Super mags are available in 10rd. I would think if you used the 147gr bullet and loaded it long the Super mags would work fine. Seems like I was able to get an OAL of around 1.160-1.180" using the 147gr bullet. That OAL is longer than the .45 Federal WC match loads I shot for years.