I cut quite a few molds for magma machines, but do it only in iron mold blanks supplied by the customer. Magma will drop ship customer orders direct to me, I cut them and ship to the address requested. Contact me for details, prices, etc. I can cut most of the cataloged molds into iron blocks, but do not make the small caliber rifle bullets. 7MM and up is fine if they aren't the longest offerings.
The reason I do not cut my aluminum blocks for Magma machines is that extensive modification is required, which costs nearly as much as ordering Magma iron blocks, but after all the work, aluminum will not stand up to the beating of these machines. This because people buy they to get fast production, and when they are pushed to get the promised production, the molds get a severe workout.
If any of you readers are considering the purchase of a Magma Master caster, may I suggest that you take a hard look at our 4 cavity molds which will cast as fast as the Magma caster promises to, howbeit with more work. In my opinion the only ligitiment reason to buy the Master caster is for those who have weak arms for whatever reason, or perhaps only one arm, in which case it is a cast bullet 'hobby saver'.