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".450/.400 3" (Kynoch and others) 400 grain @ 2150 (30" barrel)"

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".45-70 (Grizzly or Buffalo Bore) 405 grain @2100 (18.5" barrel)"

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"While the 450/400 is approx. .411, the 45-70 is .458 so the sectional density is greater, the kinetic energy is more and the Taylor knockdown # is higher."

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"The Westley Richards factory load in my .450/.400 3" is 400g Woodleigh at 1995 fps from the 25 1/2 inch barrels."

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Fine, but why compare a silly overload in one to an underload in the other? Late run, original factory Kynoch (Cordite) runs 2060-2070 fps in my 26" barrels. It ran 2050-2060 in a 24" Jeffery a few weeks ago.

And the .400 does it at a standard pressure that is ideal for a dangerous game rifle. The .400 case is much larger than the .45/70. The 45/70 can drive a 400 grain bullet to similar velocity only at much, much higher pressure.

Dangerous game + high pressure = really dumb.

The failing of the .45/70 is that it can't drive a bullet of adequate sectional density at an adequate velocity, or at low enough pressure, to be considered ideal for use on dangerous game - far from it. The .450/.400 can.

Whatever formula or theory you subscribe to, the .450/.400 beats the 45/70, badly.
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"Serious rifles have two barrels, everything else just burns gunpowder."

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