King, my dedicated steel shot double is a 12ga '60s or 70's Miroku/Daly with the chokes opened to IC and Mod. I shoot steel twos and have had no trouble at all.

I'd agree with Stan that the SKB would be fine if the full choke barrel is opened to Mod., but would also point out that Mod choke shoots steel in a pretty tight pattern so it might be more useful to open to IC and MOD...Geo