The EAA Baikal IZH-94 O/U combo was my first thought for the solution also. It can be acquired in 12ga/.30-06 12ga/.308 win 12g/.223(all 3" with 3 chokes?), and in 0.22"/20 bore & .22/410(?) for the ever competitive sportsman. Here's one listing:
http://www.budsgunshop.com/catalog/product_info.php/products_id/51637 . For some reason I want to think that the 0.22" combo have a reverse tube configuration, but that's just from memory(
http://www.eaacorp.com/ click "Firearms" on the left side, "+" on "Long Guns" & then "MP94/IZH 94" ). Some barrel block work will make it a tack driver, but out of the box with an assortment of any ammo by any vendor with any bullet weight, hands down it will have better accuracy than about any combo you can put your hands on, especially for the money. I'm pretty confident one could shoot non-tox down the chrome lined tubes.
Kind Regards,
Raimey
rse