To the very best of my recollections the only SxS I have ever owned without at least one through lump is an American Gun Co hammer gun, hardly what one would refer to as a "Best". It would thus seem to me there are a lot of factors of more importance in deciding upon a "Best" then whether or not it has through lumps. The Strength factor is of course one of the frame, not the lumps themselves, metal below the hinge pin cut adds nothing to the strength of the lump. When frames crack they do so at the juncture of the standing breech & bar, not across the hinge, so this would seem to be a point not worth arguing. The fact the normal boxlock has less metal there than a sidelock as well as having the tumbler axles hole drilled through the high stress area is point that has been argued for many many long years, in spite of a recent post to the contrare. Due to this many have contended a boxlock cannot be considered a "Best".
