I've been haveing problems loading the Lee 1oz slugs into Fed and Fiocchi shells. I ordered a couple bags of the Claybuster equivalent Fed 12S3 wads, but they have ribs on the inside of the petals. This bulges the hull out when you load the slug. Do the name brand Fed 12S3 wads have this rib? Lee gives this wad in their loading data for their slugs in Fed hulls, so I figured it would work.