I could be wrong on this, but my experience is that most of the very few shotguns built with "Stepped" chambers, were done so for use with paper shells, not Brass. Brass shells were thinner & used oversize wads, a stepped chamber would be undesirable for them. Most guns built specifically for use with brass shells had oversize bores but conventional comes. Several of my earlies Lefevers were so built.
R Marshall;
Nice find indeed there. My very first double was a J Stevens Arms & Tool Co hammerless, though a good bit later than this one. Could have been as early as around 1907 I think but pre WWI for sure.
