I have been frustrated as well. Have one of their "nitro's" from before the first world war with with 3.5" chambers (1 1/4 ounce proofs - I believe a proprietory pigeon load of some sort) and Whitworth barrels. Tightly choked with exterior locks (no typo), it is a box bird thumper. The 3.5 inch chambers make for nice forcing cones with modern 1 1/4 loads. Very neat gun.