| 400NitroExpress |
| (.400 member) |
| 14/05/06 08:27 AM |
Re: 450/400 = 45-70? (!)
|
Lots of errors here.
In reply to:
".450/.400 3" (Kynoch and others) 400 grain @ 2150 (30" barrel)"
Kynoch never listed the .400 Jeffery at 2150. They listed it as 2125 from a 30" barrel.
In reply to:
".45-70 (Grizzly or Buffalo Bore) 405 grain @2100 (18.5" barrel)"
Buffalo Bores lists 2000 fps for the 405 grain from a 22" barrel. Grizzly lists 2050 fps, but don't mention barrel length (which usually means a long test barrel).
In reply to:
"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."
??? The sectional density of the .400 bullet is much greater than that of the .45/70. The sectional density of the 400 grain .400 bullet is .338, which is very high - among the highest of the flanged nitro expresses. The sectional density of the 405 grain 45/70 is .276, which is poor for a dangerous/heavy game bullet. None of the popular flanged nitro expresses used a bullet with a sectional density that low. This is where the 45/70 really falls short. It needs 500 grain bullets to achieve comparable sectional density and it can't drive them to the required velocity for deep penetration.
Bullet diameter has nothing to do with kinetic energy.
In reply to:
"The Westley Richards factory load in my .450/.400 3" is 400g Woodleigh at 1995 fps from the 25 1/2 inch barrels."
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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