Aluminum cases can be reloaded, but should they? Alum. cases have a very short life, sometimes just one reload before they split, crack and lose neck tension. I tried some 45 ACP, don't remember the manufacturer but they were Boxer primed ( 45 is fairly low pressure and brass lasts for a very long time, many reloads) and got one reload and case cracked on sizing and a couple had no neck tension, couldn't properly resize. Just my experimenting...
So far cartridge brass is the best material for ammunition cases. I've tried reloading aluminum and steel cases, (I have one stainless steel 2 piece case I looked at, ain't gonna try reloading that!) but mostly not worth the time and effort...