Thinking about a .284 or 7mm SAUM build in the future. Short actions really seem to limit these cartridges w/ 180+ gr pills, but I am not willing to go to a full long action. Is there a way to make a 591 action a 'medium' action with some milling? I know Defiance makes some Medium actions proper, but I haven't found the real difference. Thoughts on best options? It seems the longest magazine option is alpha type 2, is this correct?