RWTF: The only double that I ever used for slugs was an Ithaca/SKB mod 100 12 ga with 26" barrels choked IC/Mod.That gun would put two Winchester Foster type slugs in the same hole at 50 yards,but unfortunately about 18" high at that range. The first time I tried it on paper I thought I had completely missed the target with the 2nd shot, so I tried again, with the same result. Digging into the dirt back stop revealed what was happening. I killed my first deer with that gun, but missed probably the biggest rack buck I ever shot at when I forgot to hold low on him. The gun also doubled on that big rack deer, so I quit using it.