Interesting, must be close then. The .240 Flanged has a rim diameter of .513 vs .545 for the 30/40 Krag. That is assuming you do not need to hold the lever open on that little H&H rifle. Pretty sure the .240 has a higher operating pressure than the .30/40. Could be wrong though, hard to find much on the .240 online. Will take a look at some of my library and see.


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