Chuck, chambers are 3-inch and the gun is made to shoot steel and/or any other known non-tox. This RBL is a go-to gun for waterfowling when limited to 5 kilos of bismuth or Nice shotshells (airline restriction). Get off the plane and buy whatever's in stock at the nearest sport shop. Actually she's not a beast at all. 8-4 is quite light as compared to most Super-Fox waterfowlers... most are way heavier than that.
For a couple of gents who emailed that they've never heard of a "thick wrist" A H Fox, here's an original 12 ga straight-grip early XE Grade that's got the special thick wrist and heavier comb. Shipped in 1918. The RBL was ordered to be comparable. Frank
