The .40-65 is a .45-70 necked down to .40 caliber. The .405 Winchester is almost a 30-40 Krag blown out (the Krag case is a bit short); IIRC the .40-70 Sharps Straight is on the .405 case. The .40 Krag is a .30-40 blown out straight. In a 98 Krag action, the 35 Krag will usually feed without issue, but the .375 Krag and .40 Krag can take some work on the magazine. Nonte wrote that he had seen a Krag in .405 Winchester, but I can't figure how it would feed; the only one I've seen was a single-shot.
The .400 Whelan and .400 Brown-Whelan (and the .411 Hawk) are all based on the .30-06 case, but probably best made from cylindrical brass rather than blowing out .30-06 brass. Doing it this way makes it easier to get the shoulder right and eliminate any issues (not much shoulder on the case).
The .400 Whelan and .400 Brown-Whelan (and the .411 Hawk) are all based on the .30-06 case, but probably best made from cylindrical brass rather than blowing out .30-06 brass. Doing it this way makes it easier to get the shoulder right and eliminate any issues (not much shoulder on the case).