If I got the Wildey I'd probably get the .45 Win Mag since factory ammo is available from several places and it's more powerful than the .44 Auto Mag. They say right on the website, "The WILDEY is made for handloaders!" so the .475 and .45 Wildey magnums are going to be roll your own. The .45 Wildey Magnum is a .475 necked down to .45 and will blow away both the .45 Win Mag, .44 Auto Mag and .44 Magnum. The .475 is the most powerful and if I was going to handload I would go for the big gun just like Charles Bronson. I really don't see much use in getting one in the weakest caliber, the .44 Auto Mag, or in the .45 Wildey Magnum.