Hi, I'd also like to recommend any of the Fabarm Line (Classic Lion I & II and the Beta Classis). I have a Beta Classis, nice gun with a round body action. Good handling and well made. Mine has 28" bbls, PG, SST and tubes (approved for steel).
The Classic Lion series pop up a lot on the auction sites, but most have 26" bbls. But longer bbls are out there.
Also worth checking out are the later SKB 200 & 385 guns, these are also tubed and rated for steel. There common on the auction sites.
Anyway, good luck and have fun looking....that's most of the enjoyment!
All the best!
Greg